Voltage Regulator wire question?

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    Author Topic: Voltage Regulator wire question?  (Read 1421 times)

    Offline NorthWestcuda

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    Voltage Regulator wire question?
    « on: May 02, 2011 - 06:47:19 PM »
    With my key on, engine off, and the VR connector disconected from the VR, should both the green and blue wires have the same voltage?
    « Last Edit: May 02, 2011 - 11:43:16 PM by NorthWestcuda »
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    1973 Cuda, 440 engine
    1972 Chevy 4x4 PU stepside
    2003 Ford F-350 Diesel


    Offline barracuda7199

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    Re: Voltage Regulator?
    « Reply #1 on: May 02, 2011 - 10:52:55 PM »
    blue should have close to 12v and the green is a ground. does it charge?
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    Brandon

    71 Barracuda 440 727                                                                 
    (O O {]{]{]|[}[}[} O O)

    Offline NorthWestcuda

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    Re: Voltage Regulator?
    « Reply #2 on: May 02, 2011 - 11:42:24 PM »
    Ya its OVERCHARGING BIG TIME!!!  It was making about 18 volts back into the battery when the engine was running. I only ran it for about 1 minute before I shut it down.  At 18 volts I was going to fry everything.  I put on a new VR and re-sanded the grounds,  it's now down to around 14.3 volts at battery with engine running.  That's still too much, given nothing extra is using juice in the car and a fully charged battery.  When its running I can pull the blue wire that goes to one of the field terminals on the alternator and it stops charging.  So the alternator is ok.  This all started when I replaced the wires on "Part #2" of my engine wire harness.  I guess the 1973-4 cuda's had a two part engine wire harness. The "engine section" of the wire harness was getting pretty bad so I just replaced the four wires that I was actually using in that part of the harness.

    I'm still thinking that the only wire that should be measuring 12 volts when the key is on, engine off, is the blue wire???  Not both the Green and Blue wires??? This is measured at the VR connector not connected to the VR though.  Is this correct or not?????

    Thanks. 
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    1973 Cuda, 440 engine
    1972 Chevy 4x4 PU stepside
    2003 Ford F-350 Diesel

    Offline Chryco Psycho

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    Re: Voltage Regulator wire question?
    « Reply #3 on: May 03, 2011 - 01:45:56 AM »
    the green wire is the ground wire out of the field so yes it should be close to the same voltage , 14.3 v is the normal charing rate
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    Offline dodj

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    Re: Voltage Regulator wire question?
    « Reply #4 on: May 03, 2011 - 10:56:47 PM »
     It is possible for the VR to think the voltage is lower than it wants because of poor connections. Bulkhead connector, five wire splice, VR connector, steering column connector can all contribute to the VR not getting the right voltage sense, making it increase the alt o/p.
    But, I don't see 14.3v being a problem.
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    Scott
    1973 Challenger  440 4 spd 
    2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
    Good friends don't let friends do stupid things. ........alone.

    Offline NorthWestcuda

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    Re: Voltage Regulator wire question?
    « Reply #5 on: May 04, 2011 - 10:06:25 AM »
    Thanks guys.  I drove my girlfriend "cuda" around last night for about 30 minutes, before hand I hooked up my handy dandy multi-meter from the battery into the inside of the car so I could constantly get a volt reading. I ran two wires directly from the battery. The multi-meter ran around 15.2 - 15.6 volts most the time.  So it looks like I should start checking the bulkhead and amp meter dash connections?  Agreed?   Is there anyway to “really” check that the voltage regulator is grounding, other than the obvious things.?
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    1973 Cuda, 440 engine
    1972 Chevy 4x4 PU stepside
    2003 Ford F-350 Diesel

    Offline dodj

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    Re: Voltage Regulator wire question?
    « Reply #6 on: May 04, 2011 - 10:48:59 PM »
    Quote from: NorthWestcuda on May 04, 2011 - 10:06:25 AM
    Is there anyway to “really” check that the voltage regulator is grounding, other than the obvious things.?
    Take a resistance reading between the VR case and the -ve battery connection. Should be zero.  :2cents:
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    Scott
    1973 Challenger  440 4 spd 
    2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
    Good friends don't let friends do stupid things. ........alone.
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