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System not charging

Discussion in 'Sparky's corner' started by S2X01, Jul 22, 2011.

Page 2 of 2
  1. S2X01

    S2X01 Well-Known Member

    Just did a full field.

    Voltage at the battery was climbing slowly during, but still never got any higher than 12.9V

    Looks like it's time for a new alt.
     
    S2X01, Jul 24, 2011
    #21
  2. S2X01

    S2X01 Well-Known Member

    New Alternator. Hooked up properly....grounded directly to battery.
    New Voltage regulator
    New Battery.

    Just started her up....volt gauge inside still read around 11V. Even after a few revs.

    This is getting expensive.
     
    S2X01, Jul 25, 2011
    #22
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member


    How sure are you of the voltmeter? What is grounded directly to the battery?
     
    LARRY70GS, Jul 25, 2011
    #23
  4. S2X01

    S2X01 Well-Known Member

    The back of the alt. is grounded to the battery. Does it need just a body ground?

    My voltage gauge inside seems to be pretty accurate....as far as I can tell anyways
     
    S2X01, Jul 25, 2011
    #24
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member


    The alternator grounds through the bracket and engine block. Try another voltmeter just to eliminate that.
     
    LARRY70GS, Jul 25, 2011
    #25
  6. S2X01

    S2X01 Well-Known Member

    My actual voltmeter for testing? Or the gauge in the car?
     
    S2X01, Jul 25, 2011
    #26
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    See if one agrees with the other.
     
    LARRY70GS, Jul 25, 2011
    #27
  8. S2X01

    S2X01 Well-Known Member

    They agree with eachother. And my multimeter says 11.8V at the battery with it running.

    Should the ground post on the back of the alternator not be used? Is that having an effect?
     
    S2X01, Jul 25, 2011
    #28
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Ground post? I've never seen a ground post. Like I said, the alternator grounds through it's mounting. It needs no other ground. I can't see what you are doing. Remove your ground, and see what happens.
     
    LARRY70GS, Jul 25, 2011
    #29
  10. S2X01

    S2X01 Well-Known Member

    On the back of the alt. there's a BAT post and a GND post. I always assumed they were self rounded...but hooked it up anyways.

    Just tried it without my exrtra ground....still falling. 11.6V at the battery this time.
     
    S2X01, Jul 25, 2011
    #30
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I've never seen a connection to the ground post on the back of the alternator. It shouldn't hurt anything though. In any case, your alternator is not charging. Only thing I can suggest is to take it back where you bought it. New or Rebuilt doesn't mean it works, Unfortunately.
     
    LARRY70GS, Jul 25, 2011
    #31
  12. S2X01

    S2X01 Well-Known Member

    Okay.... with the help of a fellow V8 member here in CO, we're slowly dwindling down the problem.

    Swapped out athe windshield wiper fuse. Now there's key on power at the pink wire on the regulator.

    Charging the battery for the night, then back at it tomorrow.
    The blue wire on the regulator/alt.(Field)... is that supposed to see 12V at key on, or while running?
     
    S2X01, Jul 25, 2011
    #32
  13. austingta

    austingta Well-Known Member

    If you do replace the alternator, buy a 12SI alternator and (therefore) convert to internal regulation. It will be much more reliable.
    Lots of clocking options are available, many with lifetime warranties for little money.
     
    austingta, Jul 25, 2011
    #33
  14. S2X01

    S2X01 Well-Known Member

    Success!!

    Reinstalled my old regulator. Took that new Chinese thing back to napa and got my $22 back:rolleyes:

    It ended up being the WINDSHIELD WIPER FUSE!!!!!

    Lesson for today: It's probably not your alternator or your regulator. Your windshield wipers need to work if you're gonna charge your electrical system.
     
    S2X01, Jul 26, 2011
    #34
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