Product Summary

One Wire Alternator, V-Belt Belt Type, Powder Coated

  • Designed to be 1.5" shorter than standard generator
  • Specifically designed for the 1939-1941 Ford engines
  • Puts out 65 amp at idle, 75 amp when cruising, and 90 amp top end
  • Features an easy one-wire hookup and come with a 5/8" wide belt pulley
  • Comes with a black powder coat finish and stock-appearing mounting bracket

Key Specs

MFG. Part #82013
Alternator Amperage90 amp

Need To Know

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Powermaster 82013 Details

If you like traditional looks and reliable, modern performance, you’ll love this cool Flathead "Shorty" 1-wire alternator. It has the look of an original generator, but is really a 12-volt, negative-ground alternator that produces 65 amps at idle and 75 amps going down the road. This model is designed to fit 1939-1948 Ford & Mercury Cars and Ford Trucks with Flathead V8s and features a simple one-wire hookup.

We offer this one wire alternator in a black powder coat finish with included stock-appearing mounting brackets (the stock fan carrier bolts to that bracket) and pulleys that accept wide 5/8” belts.

  • 1.5" shorter than standard generator
  • Easy one-wire hookup
  • 65 amp idle, 75 amp cruise, 90 amp top end
  • 5/8" wide belt pulley included
  • If using 3/8" wide belt, order pulley # 910-67178
  • Uses stock-appearing bracket and fan carrier bolts
  • Multiple carb apps, (1) 4 barrel carb



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.

Powermaster 82013 Specifications

MFG. Part #82013
Alternator Amperage90 amp
Speedway Motors Catalog Part #255-82013
One Wire AlternatorYes
Belt TypeV-Belt
Alternator Case StyleGenerator
Voltage Required12-Volt
Alternator FinishPowder Coated
Alternator Pulley IncludedYes
Belt Width0.625"
Alternator Brackets IncludedYes
Overall Length7.50"
Sold in QuantityEach
NotesThis alternator is 1.5 in. shorter than the stock generator. Not recommended for use with generator mounted radiator fans. Includes a 5/8 in. width pulley.
GTIN Code692209016380
Belt IncludedNo
Pulley StyleV-belt
Regulator StyleInternal
Regulator IncludedYes
Coating TypePowdercoated