Product Summary

Many Engines, One Wire Alternator, V-Belt Belt Type

  • Alternators is internally regulated
  • Will work as either a 1 or 3 wire operation
  • Includes a single groove pulley that will accept a V-style belt
  • Fits most 1965-'85 GM's with straight mount 6.61 inch bolt spacing
  • Puts out 150 amp with 90 amps at idle, and 125 amps at cruising speed

Key Specs

MFG. Part #37293

Need To Know

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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
  • 150 amp with 90 amps at idle, and 125 amps at cruising speed

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.


MFG. Part #37293
One Wire AlternatorYes
Belt TypeV-Belt
Alternator Case StyleGM 12SI
Alternator Amperage150 amp
Voltage Required12-Volt
Alternator FinishChrome plated
Alternator Pulley IncludedYes
Belt Width0.375"
Alternator Brackets IncludedNo
Overall Length6.25"
Centerline of Holes6.61"
Sold in QuantityEach
GTIN Code692209004387
Belt IncludedNo
Pulley StyleV-belt
Regulator StyleInternal
Regulator IncludedYes