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Mod | | | Forums66 Topics128,134 Posts1,056,740 Members48,454 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2009 Posts: 123 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 123 | 1953 Chevrolet 3100, converted to 12 volts with alternator. Drove my truck today and amp gauge shows charging max all the time. Battery was almost 5 years old so I replaced it. Same charging status with new battery. New battery showing 13 plus volts with engine off. In the past at start up, amp gauge would be in the middle or minus until engine rpm rose up, then show plus charge. So, can the alternator fail in the "charge only" position? Alternator is 7 years old but not many miles on it. One of these: http://www.oldchevytrucks.com/cart/index.asp?sdes=rehp136Can I buy one at a FLAPS? Thanks for any input. Joe | | | | | Joined: Feb 2004 Posts: 29,841 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,841 | Yes, it can. If the regulator supplies full voltage to the field coils the alternator will go into full current output and severely overcharge the battery. A shorted power transistor in the regulator will full-field it. At speeds above idle, the voltage can go to 20+ volts or more.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Check the voltage when it is running. If it goes much over 14 volts the regulator is bad like Lincoln says. Repair it emidiatly or you will damage the bat. & electrical components.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Is that a 1 wire alternator? If it is a 3 wire I can put a new reg. in it for you. I'm right over there in Northmoor.
George
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Sep 2009 Posts: 123 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 123 | Thanks for the offer George. I already have it at a repair shop.
Joe | | |
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