Powermaster 27294 GM 12SI 100 Amp Alternator, Polished
One Wire Alternator, V-Belt Belt Type, GM 12SI Alternator Case Style, 12-Volt Voltage Required
Powermaster's most popular GM alternator fits most models, 1965-'85 with straight mount 6.61 inch bolt spacing.
- Works as 1 or 3 wire operation
- Internally regulated
- Pulley included, single groove
- V-belt style
- 100 amp with 70 amps at idle, and 90 amps at cruising speed
- Hand buffed, polished, and high colored for beautiful polished finish
Powermaster Alternator FAQ's (Link)
See the difference between the popluar alternators we offer by reading our tech article, GM Alternator Buying Guide (Link) and learn how to correctly install your new 1-wire alternator by reading our tech article, 1-Wire Alternator Conversion (Link).
Powermaster's warranty is one year from the date of purchase on all street rod components, and 90 days for any component use for an off road or race application.
Powermaster will provide technical support regarding warranty claims and inquiries directly to the purchaser to help resolve any warranty claims or necessary technical support for warranty resolution. Component or components can be returned to Speedway Motors as long as the product is still under warranty.
All customer service inquiries pertaining to warranty and defect claims are to be handled by Speedway Motors if under one year street or 90 days race. If the product is out of warranty please contact Powermaster direct to discuss their repair and return program.
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Q & A
In this episode, Project Chevelle takes a big step in its muscle car transformation. It's out with the little old 307 and to the dyno with our new 383 from BluePrint Engines!
Learn how to select a GM style alternator for your street rod or muscle car application.
One wire alternators offer a simplified installation and a clean setup.
Brief review of the different types of Ford alternators and regulators available through Speedway Motors.
Kevin W. walks through each step of installing a new alternator bracket on a 454 Big Block Chevy.
These are the specifications for the alternator and A/C brackets from Bill's Hot Rod Company available at Speedway Motors.
A routine weekly maintenance checklist to perform between each race in order to keep a clean and efficient race car at the track.