12SI Racing High Output Alternator - One Wire Turn On

SKU: 8302-250-799

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$399.00 $499.00

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Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin units feature premium bearings to withstand high engine rpm and utilize dual plate rectifier with 12 heavy duty diodes for improved cooling. Hairpin Units are a more reliable alternator to withstand high heat, high demand for your racing applications

This unit is a direct replacement for standard Delco 10DN, 10SI, and 12SI alternators, making it easy to install on most 1963-1985 GM vehicles. This direct replacement makes for an easy installation! To activate the alternator, you only need to connect a single wire from the provided pigtail to any ignition switched 12V+ source. This allows the alternator to turn on and off with the ignition switch. This unit is for a racing application, be sure to select what pulley design is needed for your vehicle in the drop down menu. Every 250amp alternator will automatically come with the OEM size pulley unless specified in your order notes.

All 12SI Applications will come with a 45 mm. (or 58mm for V Belt) pulley and will require installing a 1/2 inch - 1 inch shorter belt.

Fitment Guide:

Make	Model	Engine	Year(s)
BUICK	All Early Models	Most Engines	63-79
BUICK	Gran Sport	All Engines	65-67
BUICK	Riviera	All Engines	63-70
BUICK	Skylark	All Engines	63-79
BUICK	Wildcat	All Engines	63-70
CADILLAC	All Early Models	All Engines	63-85
CHEVROLET	All Early Models	Most Engines	63-85
CHEVROLET	C10 Pickup	All Engines	63-78
CHEVROLET	Camaro	All Engines	67-80
CHEVROLET	Caprice	All Engines	66-77
CHEVROLET	Chevelle	All Engines	64-73
CHEVROLET	Chevy II	All Engines	63-68
CHEVROLET	Corvette	All Engines	63-79
CHEVROLET	El Camino	All Engines	64-77
CHEVROLET	Impala	All Engines	63-77
CHEVROLET	Malibu	All Engines	64-77
CHEVROLET	Monte Carlo	All Engines	70-77
GMC	All Early Models	All Engines	63-85
GMC	C15 Pickup	All Engines	67-78
OLDSMOBILE	All Early Models	V-8	63-85
OLDSMOBILE	442	All Engines	65-71
OLDSMOBILE	Cutlass	All Engines	63-76
OLDSMOBILE	F85	All Engines	63-72
PONTIAC	Early models	V-8	63-85
PONTIAC	Firebird	All Engines	67-70
PONTIAC	GTO	All Engines	64-71
PONTIAC	Tempest	All Engines	63-70
PONTIAC	Ventura	All Engines	71-77

All 12SI Applications will come with a 45 mm. (or 58mm for V Belt) pulley and will require installing a 1/2 inch - 1 inch shorter belt.

Fitment Guide:

Make	Model	Engine	Year(s)
BUICK	All Early Models	Most Engines	63-79
BUICK	Gran Sport	All Engines	65-67
BUICK	Riviera	All Engines	63-70
BUICK	Skylark	All Engines	63-79
BUICK	Wildcat	All Engines	63-70
CADILLAC	All Early Models	All Engines	63-85
CHEVROLET	All Early Models	Most Engines	63-85
CHEVROLET	C10 Pickup	All Engines	63-78
CHEVROLET	Camaro	All Engines	67-80
CHEVROLET	Caprice	All Engines	66-77
CHEVROLET	Chevelle	All Engines	64-73
CHEVROLET	Chevy II	All Engines	63-68
CHEVROLET	Corvette	All Engines	63-79
CHEVROLET	El Camino	All Engines	64-77
CHEVROLET	Impala	All Engines	63-77
CHEVROLET	Malibu	All Engines	64-77
CHEVROLET	Monte Carlo	All Engines	70-77
GMC	All Early Models	All Engines	63-85
GMC	C15 Pickup	All Engines	67-78
OLDSMOBILE	All Early Models	V-8	63-85
OLDSMOBILE	442	All Engines	65-71
OLDSMOBILE	Cutlass	All Engines	63-76
OLDSMOBILE	F85	All Engines	63-72
PONTIAC	Early models	V-8	63-85
PONTIAC	Firebird	All Engines	67-70
PONTIAC	GTO	All Engines	64-71
PONTIAC	Tempest	All Engines	63-70
PONTIAC	Ventura	All Engines	71-77

Shipping
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Returns
We offer free returns within 30 days. All you have to do is fill out the return slip that you received in your package and stick the prepaid label on the package.Please note that it can take 2 weeks for us to process your return. We will do our best to complete this process as soon as possible.

We provide a 2-year limited warranty, from the date of purchase for all our products.

If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.

This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).

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