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Negative ground, Will accept a V-type belt with a width of 0.625\", This alternator is internally regulated has 90 max amps, Puts out 65 amp at idle, 75 amp when cruising, and 90 amp top end, Specifically deigned to fit the 1939-1948 Ford Flathead V8 engine Powermaster 82011 12V PowerGEN 39-48 Flathead Alt, Neg. Ground Sku # 25582011 Mfr. Part # 82011-2 Condition New Brand Powermaster Sold Each Details
When it comes to alternators, Powermaster has some of the best in the business. This PowerGEN alternator fits 1939-48 Fords. Alternator is internally regulated has 90 max amps. Features a black powder coat finish. Sold each.
- Negative ground
- Internal regulator
- 65 amp idle, 75 amp cruise, 90 amp top end
- 12 volts
- Black powder coat finish
- Sold each
Alternator FAQ (Link)
Specs One Wire Alternator Yes Alternator Case Style Generator Alternator Amperage 90 amp Voltage Required 12-Volt Regulator Internal Regulator Style Internal Alternator Finish Powder Coated Regulator Included Yes Alternator Pulley Included Yes Belt Width 0.625" Alternator Brackets Included No Color Black Sold in Quantity Each MFG. Part # 82011-2 Notes For use in negative ground systems. GTIN Code 692209016397 Belt Included No Pulley Style V-belt Coating Type Powdercoated Belt Type V-Belt Reviews Yes Rated by Grizzly adams on July 20, 2026
Summary: Easy to fit good tech support
Yes, I recommend this product.
This part was exactly what I needed Rated by Jackie on July 06, 2025
Summary: Replaced my generator on my flathead with the one wire powergen. Works great.
Yes, I recommend this product.
I would buy this product for my next flathead Rated by Louver Dude on July 02, 2022
Summary: goes on my '39 flathead motor
Yes, I recommend this product.
EXCELLENT Rated by VINTAGE HANK on September 20, 2019
Summary: EASY INSTALLATION VINTAGE LOOK
Yes, I recommend this product.
Related Items / Suggested Parts Powermaster PowerGEN 1939-48 Flathead Ford 1-Wire Alternators, 12-Volt 1939-1948 Ford Flathead Generator Cover, 1-Hole, Stainless Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
