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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2025 Posts: 3 Moderated | | Moderated Joined: Aug 2025 Posts: 3 | I have a generator without any tags or markings (other than those by the posts). How can I tell if it is a 6 volt generator or a 12 volt generator? | | | | | Joined: Dec 2022 Posts: 87 'Bolter | | 'Bolter Joined: Dec 2022 Posts: 87 | I believe that 12vs will have a red part number tag and 6vs will be in black.
Pedals 3
Paddles 0
| | | | | Joined: Jan 2022 Posts: 2,447 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,447 | Except he said "I have a generator without any tags or markings".
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Dec 2022 Posts: 87 'Bolter | | 'Bolter Joined: Dec 2022 Posts: 87 |
Pedals 3
Paddles 0
| | | | | Joined: Mar 2014 Posts: 4,483 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,483 | In this case, I would take it to any auto parts store and have them test it for output. Normally they won't charge you to do that.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Sep 2009 Posts: 5,837 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,837 | JayCee - There should be numbers stamped into the side of the generator case that we can use to decode what it is. You may have to do some cleaning to allow for viewing/picture taking.  According to a little research through some resource documents, your '54 GMC would have been originally equipped with one of 3 different generators. All are 6 Volt. The original units will have one of these 3 numbers stamped on the generator case: 1100018 = 45 amp 6 volt (Delco Remy offered an "18-U" Rebuilt starter as replacements for this unit)* 1105009 = 40 amp 6 volt (Low cut-in rpm) 1106757 = 55 amp 6 volt * This unit also listed as standard equipment for Chevrolet trucks of the same year. Resource info taken from a 1954 AEA Original Equipment Parts Catalog and both GMC and Chevy Master Parts Books
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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