Product Summary

  • Engineered to use the stock mounting bracket
  • Kit includes a pulley to fit a 5/8" wide belt
  • Designed to retain the original generator appearance
  • Puts out 65 amp idle, 75 amp cruise, and 90 at amp top end
  • Specifically designed for the 1939-1948 Flathead Ford engines

Key Specs

MFG. Part #

Need To Know

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Return Policy


If you like traditional looks and modern performance, you’re gonna love this cool Flathead 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.

Designed to fit 1939-1948 Ford & Mercury Cars and 1939-1947 Ford Trucks with Flathead V8s. These feature a simple one-wire hookup and are available in black or polished aluminum.

  • Retains original generator appearance
  • Easy one-wire hookup
  • 65 amp idle, 75 amp cruise, 90 amp top end
  • Uses stock mounting bracket
  • Includes pulley for 5/8" wide belt
  • Pulleys for 3/8" wide belt available seperately



  • 75 amps max
  • 7" length from front to back
  • Case can be shortened for additonal clearance
  • Case diameter is 1/4" larger than a stock generator



  • 75 amps max
  • 7" length from front to back
  • Case can be shortened for additonal clearance
  • Case diameter is 1/4" larger than a stock generator
  • Powergen Cutaway View (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 #
One Wire AlternatorYes
Belt TypeV-Belt
Alternator Case StyleGenerator-Look
Alternator Amperage90 amp
Voltage Required12-Volt
Alternator Finish
Alternator MaterialAluminum
Alternator Pulley IncludedYes
Belt Width0.625"
Alternator Brackets IncludedNo
Overall Length7.00"
Sold in QuantityEach
NotesIf needed the rear case can be trimmed down 1-3/4" for carb clearance.
Belt IncludedNo
Pulley StyleV-belt
Regulator StyleInternal
Regulator IncludedYes