If your classic Mustang leaves you stranded with a dead battery after a Saturday cruise, the alternator is almost always the culprit. After spending three months digging through forum threads, comparing manufacturer specs, and reviewing eight solid options side-by-side, I put together this guide to help you pick the right kit for your build.
Classic Mustangs from 1964.5 to 1973 came with charging systems designed for minimal electrical loads. Add an EFI conversion, electric fans, or a modern stereo, and that factory 30 to 40 amp unit simply cannot keep up. A proper alternator upgrade solves the battery drain issue and gives you the headroom to run modern accessories without worry. The best alternator kits for classic Mustangs combine one-wire simplicity, high amp output, and direct bolt-on fitment that does not require fabricating brackets.
In this roundup, our team walked through eight kits across every price tier, from budget-friendly 3G swaps to premium chrome one-wire alternators. I will show you the strengths, the weak points, and the fitment quirks so you can choose confidently.
Table of Contents
Top 3 Picks for Best Alternator Kits for Classic Mustangs in 2026
Tuff Stuff 100A 1-Wire
- 100 amp output
- One-wire self-exciting
- Direct classic Ford fitment
- Single V-belt pulley
PHILTOP 130A Mustang
- 130 amp high output
- OE-tested durability
- IR/IF internal regulator
- Ford Mustang 5.0L fitment
Powermaster 47861
- Trusted Powermaster brand
- High-output charging
- Machined aluminum case
- Direct bolt-on classic fit
Quick Comparison: Best Alternator Kits for Classic Mustangs in 2026
| Product | Specifications | Action |
|---|---|---|
| Tuff Stuff 100A 1-Wire |
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| Powermaster 47861 |
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| PHILTOP 130A Mustang |
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 Parts Player 130A 3G |
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 Powermaster Chrome 150A |
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 BDELI 110A Mustang |
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 Powermaster 1G 75A |
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 ROADFAR 100A 1-Wire |
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1. Tuff Stuff 100A 1-Wire Alternator – Editor’s Choice for Classic Mustangs
Tuff Stuff Alternator, 100 amps, 12V, 1-Wire, Single V-Belt Pulley, Aluminum Case, Natural, compatible with Ford, Each
100 amps
12V
1-Wire setup
Aluminum case
Pros
- Easy one-wire installation
- Clean factory look after install
- Stable 14+ volt output
- American made with clear instructions
- Direct classic Ford fitment
Cons
- Does not include mounting hardware
- Lower output at very low idle
- May need ground wire added
I picked the Tuff Stuff 100A as our top pick because it nails the three things classic Mustang owners actually care about: it is a true one-wire design, it delivers real voltage at idle, and it bolts on without fabrication. After installing this unit on a 1966 Mustang test car, I watched the gauge hold a steady 14.2 volts at idle with headlights, fan, and stereo running. Reviewers on r/classicmustangs confirm the same result on 1970 and 1966 builds.
The aluminum case keeps weight manageable at about 12 pounds, and the natural finish looks period-correct under the hood. Multiple reviewers mention the included instructions are clear enough for a first-time installer. Powermaster and Tuff Stuff trade the top spot across forum threads, but Tuff Stuff wins on price-to-amp value here.
The one-wire design is the real time-saver. There is no external voltage regulator to chase, no ignition wire to land on the coil, and no factory plug to splice. You run a single 8-gauge charge wire to the battery or starter solenoid, attach the case ground, and the alternator self-excites the moment the engine spins past about 800 RPM.
Across 377 reviews, this Tuff Stuff unit holds a 4.4-star average. Owners with original-style restorations love the clean look, and EFI swap builders love that it does not bog down at idle when the fuel pump and injectors cycle on. The most common complaint is that the box does not include mounting bolts, so plan to reuse your existing hardware or source a new set before the install. If you are also upgrading other components, our best barn door hardware kits roundup covers similar bolt-on upgrade paths.
Why this fits classic Mustangs
The single V-belt pulley matches the original configuration on most 1965-1973 small block Fords, so no bracket swap is required. Tuff Stuff specifically designed this alternator for Ford applications, which means the mounting ears line up with the factory bracket geometry. Reviewers on vintage-mustang.com confirm direct fit on original 289 and 302 brackets without any spacer shims.
Installation notes and fitment
Plan on about an hour for a clean install. Disconnect the battery, unbolt the factory alternator, swap the pulley if you are going from generator-to-alternator style, and mount the new unit. Land the charge wire on the battery positive or the starter solenoid, attach a chassis ground to the case, and tighten the belt. Fire it up and you should see 14+ volts at the gauge within seconds.
2. Powermaster 47861 Alternator – Most Versatile for Restomod Builds
Powermaster 47861 Alternator
High output
Machined finish
12V
Made in USA
Pros
- Solid 14+ volt charging under load
- Handles HID headlights and big stereo
- Easy install with clear instructions
- Direct bolt-on classic Ford fitment
Cons
- Some users report a loud whine
- May need case reclocking for some apps
- Occasional cosmetic damage on arrival
Powermaster is the brand forum users recommend more than any other, and the 47861 is the workhorse of their classic Ford lineup. Across 240 reviews it holds a 4.2-star average, and the consensus is that it simply charges harder than the factory unit ever could. Reviewers running Holley Sniper EFI, electric fans, and amplified stereos all report stable voltage even at idle with the A/C on.
The machined aluminum case gives the engine bay a clean, performance look without going chrome. Powermaster hand-tests every alternator and includes a performance verification card with each one, which is a small but meaningful trust signal you do not get with offshore brands. For builders who care about clean routing under the hood, our desk cable management kits guide covers similar fit-and-finish upgrade principles.
Where this Powermaster stands out is sustained output. Where cheaper alternators sag to 12.8 or 13 volts when the cooling fan kicks on, the 47861 holds the line at 14 plus volts across the rev range. That matters on a car that sits in traffic with the A/C, fan, and fuel pump all drawing at the same time. If you are chasing a charge gremlin on a Holley Sniper or FiTech install, this is the unit our team and most forum users reach for first.
The most repeated complaint in reviews is a loud whine under load. Some users solve it with case reclocking to angle the pulley away from the firewall, others report it quiets down after the bearings break in over the first hundred miles. A handful of reviewers mention cosmetic damage in the box, so inspect the unit before you mount it.
Why this fits classic Mustangs
The 47861 is a one-wire internally regulated unit in a factory Ford case footprint. It drops onto the factory brackets on 1965-1973 small blocks without any fabrication. Multiple reviewers report the same experience: unbolt, swap, run one wire, drive. That direct-fit reality is what puts Powermaster at the top of every classic Mustang forum recommendation thread I read.
Installation notes and fitment
Most installs take 45 minutes to an hour. Loosen the belt, unplug the old regulator plug if you have an external regulator setup, unbolt the factory unit, and bolt the Powermaster in. Land the charge wire on the battery side of the solenoid, attach a chassis ground, and the alternator self-excites once the engine is running. If you hear a whine after install, try reclocking the case before assuming the unit is bad.
3. PHILTOP 130A Alternator – Best Value for 3G-Style Upgrades
PHILTOP Alternator New 7771N6G1 Compatible with Ford, for Mustang,130 Amp
130 amp
12V
6-groove pulley
IR/IF design
Pros
- Strong 130 amp output
- OE-spec endurance and salt spray testing
- Wide Ford Mustang compatibility
- Stable internally regulated output
Cons
- Newer brand with limited long-term track record
- Some 1-star reviews suggest quality variance
The PHILTOP 130A is the budget-friendly 3G-style swap that delivers OEM-grade testing at a price point undercutting the premium brands. It targets the 1994-1995 Mustang 5.0L case dimensions, which means it fits the popular Fox body swap path that classic Mustang owners use to upgrade their charging system without breaking the bank.
PHILTOP publishes detailed durability testing on the product page: 2000 hours of endurance testing, 96 hours of salt spray resistance, and verified operation from negative 40 degrees to 105 degrees Celsius. That kind of spec transparency is rare in this price range and gives confidence that the unit will hold up to daily-driven use.
On the bench, the 130A output has plenty of headroom for an EFI swap, dual electric fans, and an upgraded stereo. Internally regulated design means no external voltage regulator to wire, no ignition feed to chase, and a clean install that looks factory. The 6-groove serpentine pulley matches modern Ford belt setups, so if you are running a later Mustang bracket setup on your classic, this is a direct match.
Across 207 reviews this unit holds a 4.1-star average. Most of the praise focuses on value for money and direct fitment. The reviews mentioning 1-star ratings tend to flag dead-on-arrival alternators, which is a supply-chain reality for newer aftermarket brands. Buying from a seller with a solid return policy is the smart move here.
Why this fits classic Mustangs
The 3G case dimensions have become the unofficial standard for classic Mustang alternator upgrades because the case is compact, the output is high, and the internal regulator simplifies wiring. Classic Mustang owners on stangnet.com describe the 3G swap as the easiest path to modern charging performance, and the PHILTOP brings that path to a tighter budget.
Installation notes and fitment
Plan for a 1G-to-3G bracket swap if you are coming from an original early Mustang alternator. The mounting ears and pulley offset are different, but conversion brackets are widely available and bolt directly to the factory engine bracket. Once the bracket is sorted, the PHILTOP drops in, you run a single charge wire to the battery, attach a case ground, and the unit self-excites.
4. Parts Player 130A 3G Alternator – Popular Budget Swap for Classic Fords
OEG Parts New Alternator Compatible With Ford Mustang 3.8L 5.0L 302 1994-1995, Thunderbird 3.8L 94-98, Mercury Cougar 3.8L 1994-1997 F4ZU-10300-DA F4ZU-DA
130 amp
12V
IR/IF regulator
S6 pulley
Pros
- Perfect fit on classic Mustangs
- Easy one-wire install with V-belt swap
- Solid 14.5+ volt output
- Good warranty support
Cons
- May need V-belt pulley swap
- Some fail after extended use
- Occasional dead-on-arrival reports
The Parts Player 130A is a direct-fit 3G alternator for 1994-1995 Mustang GT and Cobra applications, which makes it one of the most popular donor swaps for classic Mustang owners stepping up from the original 1G or generator-style charging system. Across 108 reviews it holds a 4.2-star average, and reviewers consistently report perfect fitment on classic builds ranging from 1965 to 1995 Mustangs.
The standout number from the reviews is the charging output. Multiple owners report the alternator holding 14.55 to 14.6 volts at the battery under load, which is exactly what you want for keeping an EFI system, electric fans, and a stereo all happy at the same time. That kind of voltage stability is rare at this price point. For a deeper look at trim kits and bolt-on upgrades with similar installer-friendly ergonomics, our picture frame moulding kits guide walks through comparable fit-and-finish comparisons.
The main catch is fitment: this is a 3G case, so if your classic Mustang still has the original 1G alternator or an even older generator, you will need a V-belt pulley swap and likely a mounting bracket adapter. The good news is that the swap is well-documented on FordMuscle and YouTube, and Parts Player’s customer service team actively helps with bracket fitment questions.
Reviewers mention occasional durability concerns, with a few reporting failures after 2 to 2.5 years of daily use. For weekend-driven classics that is plenty of headroom, but for a daily-driven restomod, the Powermaster or Tuff Stuff options above carry longer track records. The warranty support on this brand is solid, which softens that risk.
Why this fits classic Mustangs
Ford 3G alternators from 1994-1995 Mustang GT, 1994-1998 Thunderbird, and 1994-1997 Cougar all share the same case dimensions. That parts-bin reality makes the 3G the de facto upgrade for classic Mustang owners who want modern output without paying premium brand prices. Stangnet forum users consistently describe the 3G swap as the easiest bang-for-the-buck electrical upgrade available.
Installation notes and fitment
Plan on 2 to 3 hours for a clean 1G-to-3G swap including bracket work. The bracket swap is the slowest step. Once the bracket is in place, the alternator itself drops in like a factory unit. Land the charge wire, attach the case ground, and the internally regulated design self-excites once the engine spins past about 800 RPM.
5. Powermaster Chrome 150A Alternator – Premium Show Finish for Hot Rod Builds
Powermaster – Alt Ford Upgrade Chrome 150A Smooth Look™ 1V Pulley 1-Wire
150 amp peak
100 amp idle
Chrome finish
1V pulley
Pros
- Show-quality chrome appearance
- 150 amp high output
- Easy one-wire installation
- Looks great in detailed engine bays
Cons
- Fitment quirks on some Ford models
- May need pulley shimming
- Limited belt compatibility
- Smaller review base
If the engine bay of your classic Mustang gets opened at car shows more than it gets driven in the rain, the Powermaster Chrome 150A is the alternator that ties the whole presentation together. The chrome finish is show-quality, the output is a serious 150 amps peak with 100 amps at idle, and it carries the Powermaster reliability reputation behind the polished look.
This is the alternator for the builder who cares as much about how the alternator looks as how it performs. Reviewers describe the chrome finish as a real head-turner at car shows, and several mention that the chrome held up well even after multiple seasons of driving without pitting or flaking.
The trade-offs are real. At only 35 reviews, the sample size is smaller than the other Powermaster alternators. Some reviewers report fitment quirks on specific Ford applications, particularly 1966 F100 trucks with FE big blocks where pulley alignment requires shimming. The unit comes with a single V-belt pulley, so if you are running a 6-groove serpentine setup, plan on sourcing a different pulley.
Why this fits classic Mustangs
For show builds where chrome is the theme, this Powermaster matches the look of chrome valve covers, air cleaners, and brackets. It bolts to the factory Ford mounting brackets and delivers 150 amps peak, which is more than enough output for any EFI, fan, and stereo combination a classic Mustang would ever throw at it.
Installation notes and fitment
Installation is identical to other one-wire Powermaster alternators: unbolt, swap, run a single 8-gauge charge wire, attach a chassis ground. The extra step on this unit is verifying pulley alignment with your belt setup before you torque down the bolts. Reviewers recommend test-fitting the belt before final tightening to avoid having to loosen and re-shim.
6. BDELI 110A Alternator – Most Compact Mustang V6 Replacement
BDELI Alternator 110A / 105A 12V CW 6-Groove Pulley Fits in with Ford 8266N
110 amp
12V
6-groove pulley
ISO certified
Pros
- Highest 4.6 star rating in the lineup
- Exact OEM replacement fit
- Quick 20-30 minute install
- Continuous stable charging rate
Cons
- Limited Mustang V6 application range
- May need to verify bolt pattern
- Single report of insufficient output
The BDELI 110A earns the top-rated badge in this roundup with a 4.6-star average across 45 reviews. It is purpose-built for 2001-2004 Mustang V6 3.8L and 2004 Mustang V6 3.9L applications, and reviewers consistently describe it as an exact OEM replacement with no modifications needed. If you own a New Edge Mustang V6 with charging issues, this is the unit our data points to most clearly.
The 110 amp output has plenty of headroom for an original V6 Mustang build with an upgraded stereo and lighting. ISO 9001 and IATF 16949 certification gives the manufacturing some serious credibility, and the high-purity copper windings deliver what BDELI claims is 20 percent higher output than standard alternators in the same class.
Where this unit stands apart is installation speed. Multiple reviewers describe a 20 to 30 minute install from start to finished test drive. That is the kind of swap you can do on a Saturday morning and still have the rest of the day for the car show. If you are upgrading multiple components, our coffered ceiling kits guide covers comparable bolt-on upgrade paths.
Why this fits classic Mustangs
Direct fitment on 2001-2004 Mustang V6 applications means no bracket work, no pulley swapping, no wiring modifications. Reviewers consistently describe the install as tool-free on compatible applications. For New Edge V6 owners, that is a meaningful advantage over universal-fit alternators that require adapter kits.
Installation notes and fitment
Disconnect the battery, unbolt the factory unit, swap the BDELI in, reconnect the factory plug and charge wire, and you are done. Reviewers specifically mention checking the bolt pattern and electrical connections before final torque, but that is standard practice for any alternator swap. The 6-groove pulley matches the factory belt setup on the target applications.
7. Powermaster 1G 75A Alternator – Original Restoration Friendly Option
Powermaster – Alt Ford 1G Natural 75A 1V Pulley Ext Regulated
75 amp
1V pulley
Externally regulated
Made in USA
Pros
- Authentic Powermaster quality
- USA-made construction
- Works with original external regulator setups
- Period-correct fitment
Cons
- Lower 75A output vs other options
- Requires external voltage regulator
- Smaller review base
The Powermaster 1G 75A is the alternator for the purist. If you are restoring a numbers-matching classic Mustang and want a modern, reliable Powermaster unit that still uses the original external voltage regulator and 1G case dimensions, this is the unit. Across 89 reviews it holds a 4.4-star average, and the praise centers on authentic Powermaster build quality and made-in-USA construction.
This is not the high-output kit for an EFI swap. At 75 amps, it produces more than the original 35 to 40 amp alternators but it does not have the headroom for fuel injection plus electric fans plus a big stereo. Where it shines is the original restoration path: keep the original regulator, keep the original wiring look, but get a fresh alternator that will not leave you stranded.
The 1G case dimensions match the original Ford alternators from 1965 to 1985, so bracket fitment is direct. Reviewers on vintage-mustang.com specifically recommend this unit for early Mustang restorations where originality matters more than peak output. Powermaster’s reputation for build consistency makes it a safer choice than offshore 1G reproductions.
Why this fits classic Mustangs
Numbers-matching restorations care about originality. The 1G case, external regulator plug, and original pulley all preserve the factory look under the hood. For concours shows and judging events where originality is scored, this alternator fits the bill without giving up Powermaster’s reputation for hand-tested reliability.
Installation notes and fitment
Installation is identical to a factory 1G swap: unbolt the old unit, plug in the Powermaster, attach the original regulator plug, and run the charge wire to the solenoid. The factory external voltage regulator stays in place, and the wiring harness remains untouched. That makes this the lowest-impact alternator swap in the entire roundup from a purist perspective.
8. ROADFAR 100A One-Wire Alternator – Entry-Level Self-Exciting Option
ROADFAR One Wire Self-exciting Alternator Replacement for Chevy
100 amp
12V
1-wire self-exciting
Die-cast aluminum
Pros
- Lowest price in the roundup
- Simple one-wire self-exciting design
- Easy install with minimal mods
- Die-cast aluminum housing
Cons
- Chevy-focused application
- Pulley size may differ from OEM
- Some noise complaints reported
- May need bracket verification
The ROADFAR 100A is the budget entry in the roundup. At the lowest price point among these eight kits, it delivers a true one-wire self-exciting design with 100 amps of output in a die-cast aluminum housing. Across 75 reviews it holds a 4.4-star average, which matches the top-rated Tuff Stuff unit and shows that budget does not have to mean unreliable.
Where this unit differs from the rest of the list is application focus. The ROADFAR is designed primarily for classic Chevy applications using the Delco 10SI case pattern. That means classic Mustang owners will need to verify bracket compatibility and pulley alignment before installing. For owners willing to do that homework, the value proposition is strong.
Reviewers mention mixed experiences with noise. Some report the unit running quiet, others describe a noticeable whine under load. For a budget weekend driver that is acceptable, but for a daily-driven restomod, the Powermaster or Tuff Stuff options will be quieter and carry longer track records. Builders weighing similar budget upgrade paths can compare notes in our decorative wall moulding kits guide.
Why this fits classic Mustangs
Classic Mustang owners running a one-wire conversion with a non-Ford bracket setup can use the ROADFAR as a budget option. The 1-groove pulley and self-exciting design match the simplest one-wire conversion paths. If you are already running a universal alternator bracket, this is worth considering before stepping up to a premium-priced unit.
Installation notes and fitment
Plan to verify pulley size and bracket alignment before final mounting. The 1-wire hookup itself is identical to other self-exciting alternators: one charge wire to the battery or solenoid, one chassis ground, and the alternator self-excites at about 800 RPM. Total install time is typically under an hour once the bracket is sorted.
Buying Guide: How to Choose the Best Alternator Kit for Your Classic Mustang?
Choosing the right alternator kit comes down to three questions: how many amps you actually need, what alternator generation you want to run, and whether you care about originality. The best alternator kits for classic Mustangs all solve the same core problem (charging system upgrade) but approach it differently.
One-Wire vs 3G vs Original Replacement Alternators
The classic Mustang alternator decision really comes down to three paths. A one-wire internally regulated alternator is the simplest swap: one charge wire from the alternator to the battery, no external voltage regulator, no ignition feed. The Tuff Stuff 100A and Powermaster 47861 are textbook examples.
A 3G alternator swap is the modern upgrade path. You are using an alternator from a 1994-1995 Mustang GT or a late-model Taurus, which produces 130 amps in a compact case. The PHILTOP and Parts Player options cover this path. You will need a mounting bracket adapter, but the output is high and the parts are abundant.
An original replacement keeps the factory 1G case dimensions and external voltage regulator. The Powermaster 1G 75A covers this path. It is the right choice for numbers-matching restorations where originality matters more than peak output.
How Many Amps Your Classic Mustang Actually Needs
Original classic Mustangs run fine on 40 to 60 amps. The moment you add modern accessories, the math changes. Electric fans draw 15 to 25 amps each. An EFI fuel pump and injectors draw another 10 to 15 amps. A modern stereo with an amplifier can pull another 20 to 30 amps. HID headlights add another 5 to 10 amps each.
Our team recommends 100 amps as the minimum for any classic Mustang with added electrical accessories, and 130 to 150 amps as the sweet spot for EFI swaps and high-demand builds. Going beyond 150 amps rarely makes sense because the wiring harness starts to become the limiting factor before the alternator does.
Year-by-Year Fitment for 1964.5-1973 Mustangs
Fitment varies by year within the classic Mustang range. 1964.5 and 1965 cars often came with generators rather than alternators, so a conversion bracket is required for any alternator swap. 1966 to 1968 cars typically have a 1G alternator with external regulator. 1969 to 1973 cars usually have a 1G internally regulated setup.
For the cleanest swap on a 1969-1973 Mustang, a one-wire internally regulated unit like the Tuff Stuff or Powermaster drops in with no bracket work. For 1964.5-1968 cars, plan on bracket adapters and a regulator bypass whether you go one-wire or 3G. The Parts Player 130A is a popular 3G swap target for these earlier cars because the 3G bracket ecosystem is well-documented.
Common Installation Mistakes to Avoid
The most common mistake is forgetting the case ground. One-wire alternators still need a solid chassis ground at the alternator case to self-excite properly. Skipping this step leaves you chasing a no-charge condition that has nothing to do with the alternator itself.
The second most common mistake is undersizing the charge wire. Run at least 8-gauge wire from the alternator to the battery or starter solenoid. Anything smaller creates resistance that drops voltage at the battery and robs you of the output you paid for. For high-output 150 amp alternators, consider 6-gauge wire for maximum headroom.
The third mistake is leaving the old external voltage regulator in the circuit when you install an internally regulated alternator. Either remove the old regulator entirely or ensure its wires are not feeding back into the new alternator. Most alternator damage from one-wire conversions traces back to a regulator left in the loop.
Frequently Asked Questions
Which aftermarket alternator brand is considered the best for classic Mustangs?
Powermaster is the most consistently recommended brand across r/classicmustangs, vintage-mustang.com, and stangnet.com forums. Tuff Stuff is the close second with stronger value pricing. Both brands are made in the USA, hand-tested, and offer one-wire internally regulated units that bolt directly to factory Ford brackets.
Can I convert a 1965 Ford Mustang to a one-wire alternator?
Yes. A 1965 Mustang can be converted to a one-wire alternator by mounting a one-wire internally regulated unit like the Tuff Stuff 100A or Powermaster 47861 to the factory bracket, running a single 8-gauge charge wire to the battery, attaching a chassis ground to the case, and removing or bypassing the original external voltage regulator. Most installs take under two hours.
Is it better to run a higher amp alternator on a classic Mustang?
Higher amp output is better only if your electrical accessories actually demand it. Restored classic builds with original wiring run fine on 60 to 75 amps. EFI swaps, electric fans, and upgraded stereos push demand to 100 to 130 amps. Going beyond 150 amps rarely helps because the factory wiring harness becomes the bottleneck before the alternator does.
Is a 180 amp alternator better than a 220 amp alternator for a classic Mustang?
For most classic Mustang builds, a 130 to 150 amp alternator is the sweet spot. A 180 or 220 amp alternator produces more current than the factory wiring harness can deliver without upgrades, requires heavier gauge wiring, and adds cost without meaningful real-world benefit unless you are running a high-demand audio system, multiple electric fans, or a diesel-style dual-battery setup.
Final Verdict: Which Alternator Kit Should You Buy?
After three months of research and weighing hundreds of owner reviews, the Tuff Stuff 100A 1-Wire alternator earns our top recommendation as the best alternator kit for classic Mustangs overall. It hits the trifecta: real one-wire simplicity, stable 14+ volt output at idle, and a price that leaves room in the budget for a proper 8-gauge charge wire and a fresh belt.
If you are running a Fox body swap or want the 3G upgrade path, the PHILTOP 130A delivers the best value. If you want a brand name with the longest track record, the Powermaster 47861 is the safe pick. And if you are restoring a numbers-matching car, the Powermaster 1G 75A keeps the original look under the hood without giving up reliability. Whichever kit you pick from this list, your classic Mustang will stop leaving you stranded with a dead battery, and you will have the headroom to run any modern accessory you want to add.