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Alternator and wiring problems

Discussion in 'The Garage' started by mtnman210, Mar 19, 2009.

  1. mtnman210

    mtnman210 1/2 ton status Premium Member

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    On the project truck I've come to find out that I'm not getting a charge. I've totally rewired the truck so it's minimal wiring and I think I found the problem. On the back of the alternator there was a plug with 2 wires. I've gotten rid of the plug and just ran 2 separate wires. Now one I believe is a hot from the battery to the alternator.( i could be wrong). Now the second wire I have no clue where it goes and it's currently hooked to nothing. So I'm sure this is where my no charging problem is.

    So where do I run this second wire? I was told it should go to a 12volt ignition hot(that would mean any circut that gets power when the ignition is on correct?), but I want to make sure before I run it to the wrong place.
     
  2. dremu

    dremu Officious Thread Derailer Premium Member

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    One should go to the ignition hot, yes, and the other should go to the ignition hot through a light bulb or resistor, IIRC.

    -- A
     
  3. mtnman210

    mtnman210 1/2 ton status Premium Member

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    yeah I keep hearing it should go to a dummy light on the dash. I never had one on the original dash and I don't have one on my other 77 k5 either. so I'm not really sure where to stick it.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Actually isn't one contant hot, the other an ignition hot? Then the charge lug to battery or starter lug.
     
  5. mtnman210

    mtnman210 1/2 ton status Premium Member

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    ???

    that would be straight to the battery?
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Well if both were hooked to ignition 12V, would there be much purpose to having two wires? I thought one was used to "sense" that the vehicle was running, thus the alternator starts working. I dunno for sure, but that's how I understand it. Any of the wiring diagrams out there should show the wiring schematic
     

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