-41%
12si classic car 250amp b-stock alternator with v-belt - JS Alternators 12si classic car 250amp b-stock alternator

12si classic car 250amp b-stock alternator

$409.00 $239.00
All
12si classic car 250amp b-stock alternator  30day warranty. 12 and 6 mounts We also have GM ad244 style 250amp b stock with serpentine pulley

14.8v Internal Regulator with pigtail plug

$45.00
All Wiring, Plugs & Harnesses
14.8v internal regulator with pigtail wiring plug harness. This item is non-returnable, no warranty.

14.8v Self Excite Regulator

$45.00
SE reg
All Apparel, Decals and Accessories Wiring, Plugs & Harnesses
14.8volt Self excite regulator. No plug connections needed. this item is non-refundable part. no warranty on diy parts. 
-42%
15.5 Volt Regulator (ONLY for charging Cmax Lithium) *Requires wiring supplied plug. (Not for AGM Battery use)) - JS Alternators

15.5 Volt Regulator (ONLY for charging Lithium over 15volts) (Not for AGM Battery use)

$95.00 $55.00
All Wiring, Plugs & Harnesses
Verify your battery’s maximum charging voltage before ordering. *Requires wiring supplied plug. *May cause Battery Light. The regulator must be installed in the alternator....
-22%
1963-1987 Olds/Buick ALL ENGINES w/ 12SI 250-320amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1963-1987 Olds/Buick ALL ENGINES w/ 12SI 250-320amp Alternator

$449.00 $349.00
7127-250-859
1963 1987 442 All Buick High Output Alternators Cutlass Delta Oldsmobile High Output Alternators Riviera
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1963-1991 Chevy Cadillac All early models V-8 250-320amp Alternator - JS Alternators 1963-1991 Chevy Cadillac All early models V-8 250-320amp Alternator - JS Alternators

1963-1991 Chevy Cadillac All early models V-8 250-320amp Alternator

$449.00 $349.00
7127-250-113
1963 1987 All Cadillac All Early Model V8 Cadillac High Output Alternators Camaro Caprice Chevelle Chevrolet High Output Alternators Chevy All Early Models V 8 Cutlass Deville Monte Carlo Seville
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1964-1984 Pontiac 250amp alternator - JS Alternators

1964-1984 Pontiac 250amp alternator

$449.00 $349.00
7111-250
1964 1984 6 4l 6 6l All All Classic Pontiac Engines Gto Pontiac High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1965-1990 Ford All except FE Engines 250-320amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1965-1990 Ford All except FE Engines 250-320amp Alternator

$559.00 $439.00
7058-320-554
1965 1990 All F 150 F250 Super Duty F350 Super Duty Ford All Ford High Output Alternators Mustang
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1965 - 1985 Ford FE High Output Amp Alternator JS Alternators High Output Amp Alternator

1965-1994 Ford FE Engines 250-320amp Alternator

$559.00 $439.00
7058-320-695
1965 1992 All Fe Engines Ford High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1966-1991 Ford Ranger 250amp Alternator - JS Alternators JS Alternator High Output Amp Alternator

1966-1991 Ford Ranger 250amp Alternator

$559.00 $439.00
7712_245621310-714264325-9109845
1966 1991 2 3l All Ford High Output Alternators Ranger
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1973-1985 Buick Regal 12SI 250-320amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1973-1985 Buick Regal 12SI 250-320amp Alternator

$449.00 $349.00
7127-250-404
1973 1985 All Buick High Output Alternators Regal
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1979-1986 Mercury Capri 250amp Alternator - JS Alternators JS Alternator High Output Amp Alternator

1979-1986 Mercury Capri 250amp Alternator

$449.00 $349.00
7712-250-204
1979 1986 5 0l All Capri Mercury High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1979-1995 Ford Mustang 250amp Alternator - JS Alternators

1979-1995 Ford Mustang 250amp Alternator

$449.00 $349.00
7712_919294729-242159860-261817581
1979 1995 5 0l All Ford High Output Alternators Mustang
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1980-1996 Chevy Caprice 250-320-370-400-425amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1980-1996 Chevy Caprice 250-320-370-400-425amp Alternator

$709.00 $559.00
7864_614608439-919362897-840962224
1980 1996 4 3l 5 0l 5 7l All Caprice Chevrolet High Output Alternators
This unit replaces the cs144 style 12/6 mount with serpentine belt. Hairpin units are commonly called 6 phase. They produce more output at idle...
-22%
1965 - 1985 Ford FE High Output Amp Alternator

1981-1987 Buick Regal GNX 250 to 320amp Alternator

$449.00 $349.00
7864_884755985-272088693-970482501
1986 1987 3 8l All Buick High Output Alternators Regal
Buick Grand National GNX Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional...
-22%
1984-2002 Toyota 4Runner 250-320amp Alternator - JS Alternators 1963 - 1985 Buick Riviera High Amp Output Alternator

1984-2002 Toyota 4Runner 250-320amp Alternator

$449.00 $349.00
14668-250-431
1984 1995 1996 2002 2 4l 2 7l 3 4l 4runner All Toyota High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1984-2005 Chevy S-10 blazer 250-320-370-400-425amp Alternator - JS Alternators

1984-2005 Chevy S-10 blazer 250-320-370-400-425amp Alternator

$709.00 $559.00
81657_21979492-453971353-584372173
1984 2005 4 3l All Chevrolet High Output Alternators S10 Blazer
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1986-1991 Mercury Grand Marquis 2G 250amp Alternator - JS Alternators

1986-1991 Mercury Grand Marquis 2G 250amp Alternator

$449.00 $349.00
7780-250-715
1986 1991 5 0l 5 8l All Grand Marquis Mercury High Output Alternators
This unit fits 2G applications only. Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than...
-22%
1986-1993 Buick Lesabre 250-320-370-400amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1986-1993 Buick Lesabre 250-320-370-400amp Alternator

$709.00 $559.00
7864_217757201-554009043-483687486
1986 1993 3 8l All Buick High Output Alternators Lesabre
The 3 Phase unit is referred to as a slot wound alternator. This unit provides power and durability at an affordable price. Featuring premium...
-22%
1986-1995 Buick Riviera 250-320-370-400amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1986-1995 Buick Riviera 250-320-370-400amp Alternator

$709.00 $559.00
7864_424736199-589290238-354183521
1986 1995 3 8l All Buick High Output Alternators Riviera
The 3 Phase unit is referred to as a slot wound alternator. This unit provides power and durability at an affordable price. Featuring premium...
-22%
1986-1996 Cadillac Fleetwood 250-320-370-400-425amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1986-1996 Cadillac Fleetwood 250-320-370-400-425amp Alternator

$709.00 $559.00
7864_245361851-751609251-903832864
1986 1996 4 5l 4 9l All Cadillac High Output Alternators Fleetwood
This 6 phase small case hairpin alternator is our more sophisticated alternator with a higher output than a standard slot wound. Along with dual...
-22%
1986-1999 Cadillac Deville 250-320-370-400-425amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1986-1999 Cadillac Deville 250-320-370-400-425amp Alternator

$709.00 $559.00
7864_832521750-965586709-566882601
1986 1999 4 1l 4 5l 4 6l All Cadillac High Output Alternators Deville
This 6 phase small case hairpin alternator is our more sophisticated alternator with a higher output than a standard slot wound. Along with dual...
-22%
JS Alternators High Output Amp Alternator

1986-2001 Acura Integra 250-320amp Universal Alternator

$449.00 $349.00
13677-250-339
1 8l 1996 2001 Acura High Output Alternators All Integra
* Please note this is a universal alternator, not a direct fit. Hairpin units are commonly called 6 phase. They produce more output at...
-22%
1986-2002 Cadillac Eldorado 250-320-370-400amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1986-2002 Cadillac Eldorado 250-320-370-400amp Alternator

$709.00 $559.00
7864_90228571-645934305-712538493
1986 2002 4 1l All Cadillac High Output Alternators Eldorado
The 3 Phase unit is referred to as a slot wound alternator. This unit provides power and durability at an affordable price. Featuring premium...
-22%
1987-1992 Ford F-150 250-320amp Alternator - JS Alternators JS Alternator High Output Amp Alternator

1987-1992 Ford F-150 250-320amp Alternator

$449.00 $349.00
7712_671698486-933786477-579965418
1987 1992 5 0l 5 8l All F 150 Ford High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-1993 Ford Mustang 250amp Alternator - JS Alternators JS Alternator High Output Amp Alternator

1987-1993 Ford Mustang 250amp Alternator

$559.00 $439.00
7712_516351897-522275073-219185551
1987 1993 2 3l All Ford High Output Alternators Mustang
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-1995 Chevy suburban 250-320-370-400amp Alternator - JS Alternators

1987-1995 Chevy suburban 250-320-370-400amp Alternator

$709.00 $559.00
81657_144508314-981423587-856483812
1987 1995 All Chevrolet High Output Alternators Suburban
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-1995 Chevy Tahoe 250-320-370-400-425amp Alternator - JS Alternators

1987-1995 Chevy Tahoe 250-320-370-400-425amp Alternator

$709.00 $559.00
81657_373595931-525351423-984894284
1987 1995 4 8l 5 3l 5 7l 6 0l All Chevrolet High Output Alternators Tahoe
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-1995 GMC Full size truck 250-320-370-400-425amp Alternator - JS Alternators

1987-1995 GMC Full size truck 250-320-370-400-425amp Alternator

$709.00 $559.00
81657_439221022-996235133-14887753
1500 Pickup 1987 1995 4 3l 5 0l 5 3l 5 7l All Full Size Truck GMC High Output Alternators Sierra
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-1996 Chevy Caprice 250-320-370-400-425amp Alternator - JS Alternators JS Alternators High Output Amp Alternator

1987-1996 Chevy Caprice 250-320-370-400-425amp Alternator

$709.00 $559.00
7864_28228048-888738890-731735093
1987 1996 4 3l 5 0l 5 7l All Caprice Chevrolet High Output Alternators
This unit replaces the cs144 style 12/6 mount. Hairpin units are commonly called 6 phase. They produce more output at idle and are more...
-22%
JS Alternators High Output Amp Alternator

1987-2001 Jeep Cherokee All engines 250-320amp Alternator

$449.00 $349.00
13341-250-963
1991 2001 4 0l All Cherokee Jeep High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-2004 GMC Suburban 250-320-370-400-425amp Alternator - JS Alternators

1987-2004 GMC Suburban 250-320-370-400-425amp Alternator

$709.00 $559.00
81657_371518866-45878610-408572586
1987 2004 4 3l 5 0l 5 3l 5 7l All GMC High Output Alternators Suburban
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-2004 GMC Yukon 250-320-370-400-425amp Alternator - JS Alternators

1987-2004 GMC Yukon 250-320-370-400-425amp Alternator

$709.00 $559.00
81657_338227373-770190282-814229801
1987 1995 4 3l 5 0l 5 3l 5 7l All GMC High Output Alternators Yukon
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1987-2005 Chevy Astro 250 to 425 amp Alternator - JS Alternators

1987-2005 Chevy Astro 250 to 425 amp Alternator

$759.00 $609.00
8165-7-425-1
1987 2005 4 3l All Astro Chevrolet High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1988-1991 Honda Civic 250-320amp Alternator.

1988-1991 Honda Civic 250-320amp Alternator

$449.00 $349.00
14989-250-118
1 6l 1988 1991 All Civic Honda High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
-22%
1988-1991 Honda CRX 250 - 320amp Alternator - JS Alternators

1988-1991 Honda CRX 250 - 320amp Alternator

$449.00 $349.00
14989-250-426
1 5l 1 6l 1988 1991 All Crx Honda High Output Alternators
Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin...
Items 1 to 36 of 659 total

Customer Reviews

2012-2021 Jeep Wrangler 250 to 425amp Alternator.

Look and Runs Amazing

Brandon Manis, April 2022

Every single audio build I’ve done always has a JS alternator. Great customer service, amazing pricing, very fast shipping, got my alternator within a week and it’s a pretty rare car so I was surprised at the speed they had my alternator built and shipped out to me. Amazing company and I will continue to use them and represent them on all of my builds, highly recommended and very good quality product.😌 (also their powder coating is perfection)

Very Nice Alternator

Paul Nelson, March 2022

I will not consider going anywhere else for my high output alternators. 10.5kw of bass amps on my daily driver and I do not lose even a thenth of a volt while driving at full tilt! Two vehicles and two alternators and zero problems with the alternators, customer support, or shipping times. Customer for life here! Do not hesitate. 👍

Super Impressed

Kino Hicks, April 2021

Just got mine and super impressed. The customer service was very helpful and I would encourage anyone who needs a high output alternator to use these guys!!!

They're so great they even shipped out my made to order alternator on New Year’s Eve.

Petey Parado, May 2021

Ordered my alternator a week before Christmas 2020.They emailed to confirm my address in Hawaii. I emailed back and they responded quickly.There so great they shipped out my made to order alternator on New Year’s Eve. I received it on the 4 of January 2021. It came with everything I needed. Shorter bet I got from local auto parts store.your JS ALTERNATOR made my sound system very happy voltage stays above 14v. THANKS,Jonathan from Kauai Hawaii..

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