1965 Chevrolet C10 - charging issues

Discussion in 'Electrical Shop' started by Woogeroo, Apr 15, 2017.

  1. Woogeroo

    Woogeroo Member

    Joined:
    Apr 27, 2003
    Messages:
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    Location:
    Seeing the USA in my Chevrolet!
    hiya folks.

    1965 Chevrolet C10 lwb stepside

    1992 350/5.7L engine with carburetor.

    1969 Chevrolet C10 alternator with external voltage regulator.

    Interstate Battery / all seasons / January 2016

    Ok, a few days ago my blinkers stopped blinking while I was riding around. I was like : hmnn, I've seen this before, it is not charging.

    I made it home and put the volt meter on it and sure enough, it was only running around 12 volts.

    Also, the big red wire going to the alternator from the wiring harness that goes to the plug on the voltage regulator was burnt up on the alternator side. I fixed that, but... what caused it? Hmnn.

    I took the alternator off and took it to the parts store, they ran the bench test on it 3 times and it passed.

    I did the Wrenchbender Ret. troubleshooting method as described in this thread here :


    1965 C10 - alternator or battery...

    and it started over charging like 15 plus volts.

    I put in the new voltage regulator, snapped the plug back in, checked all the wire connections... fired it all up and it is only reading 12.39 volts.

    I'm confused now, what else can I check?

    Maybe the bench test was wrong and the alternator is off just enough?

    Check continuity in all of the wires in the harness from the alternator to the voltage regulator?

    Thanks folks.

    -W
     
  2. Bill Hanlon

    Bill Hanlon Member

    Joined:
    Jun 4, 2002
    Messages:
    2,227
    Location:
    Klein TX

    Burnt up like electrically not making connection from one end to the other of the wire? If so, just being loosely connected to the alternator can cause a high resistance which generates heat at the high resistance which can eventually burn open the wire.
     
  3. Woogeroo

    Woogeroo Member

    Joined:
    Apr 27, 2003
    Messages:
    10
    Location:
    Seeing the USA in my Chevrolet!
    Yes Sir... it was toasted. I cut it back down the wire to some good and re-wired it. I don't know if it got old and dry or what exactly.

    I think I have it back working again...

    details :




    Took the battery out and went to the store to have it tested by their fancy machine, it passed.

    Checked all of my connections again.

    Checked the wires from the alternator to the voltage regulator for continuity with my volt meter... they were all good as well.

    Double checked the ground wire on the voltage regulator and moved it to the side on the bare metal.

    Snugged everything down again... fired it up... when I revved it up, it was showing good 14 plus volts again.

    So... I guess it is good now.

    When I took it for a spin I noticed it is loosing anti-freeze... and traced it back to the heater core.

    Well, at least that is something I know how to fix.

    Happy Wrenchin' Folks,

    -W
     

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