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| | | Forums66 Topics128,018 Posts1,055,342 Members48,419 | | 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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I was looking through my spares the other day and picked up the generator that I used on my truck before converting to 12 volts. It was working fine at the time. I I pulled the inspection band and the commutator is a grey silver colour. There is no hint of a copper colour. What would cause this appearance? | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | Oxidation of the copper commutator bars. A little non-conducting sandpaper (NOT emery cloth) held against the commutator while it's spinning in a lathe or a drill press will shine it up before putting it back into service.
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: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Thanks Jerry. I thought there had been some kind of transfer take place.
Fred | | | | | Joined: Dec 2018 Posts: 2,450 'Bolter | | 'Bolter Joined: Dec 2018 Posts: 2,450 | truckernix If there is any hydrochloric acid close to copper , fumes from it will do that. | | |
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