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Excessive Voltage

Discussion in 'Intermediate CJ-5/6/7/8' started by Bryon Traveline, Sep 2, 2017.

  1. Sep 2, 2017
    Bryon Traveline

    Bryon Traveline New Member

    Vienna,ohio
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    Aug 9, 2017
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    My 76 is making 17 volts, I have a new battery, new solonoid and new voltage regulator. What do I need to do to get the voltage back down where it should be?
     
  2. Sep 2, 2017
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    16.8V on battery that need charging is normal. A new battery does not mean it is fully charged. Monitor the charge rate for a while and see if it drops back to 14.8 or so.
     
  3. Sep 2, 2017
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    USA
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    Maybe your regulator is not hooked up correctly. With no regulator your alternator will charge at about 18 volts.
     
  4. Sep 2, 2017
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Six or V8? The sixes use a Delco 10SI alternator, and the voltage regulator is inside the alternator. A V8 uses the Motorcraft alternator and an external regulator. It's hard to wire the Delco 10SI wrong, but the V8's external regulator could be connected wrong. Seems unlikely though.

    There is an acceptable voltage range for the Motorcraft in the 1976 TSM here JeepĀ® 1976 TSM online - charging system is in section 3. The peak allowable voltage for the Motorcraft is 14.8 volts. I would check that your meter is accurate by comparing the reading to a second meter. If it is, you can read and follow the troubleshooting instructions for overcharging in the TSM.
     
  5. Sep 2, 2017
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    BTW welcome from Boston! First post!
     
  6. Sep 2, 2017
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Sometime a poor connection on the voltage sensing circuit will fool the reg into thinking the battery is low, and it overcharges.
     
    Bryon Traveline likes this.
  7. Sep 2, 2017
    Bryon Traveline

    Bryon Traveline New Member

    Vienna,ohio
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    Thanks for the help, will be digging into it tomorrow
     
  8. Sep 25, 2017
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    What did you find on this problem Bryon?
     
  9. Sep 26, 2017
    Bryon Traveline

    Bryon Traveline New Member

    Vienna,ohio
    Joined:
    Aug 9, 2017
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    It seems my multimeter is bad , borrowed a buddies and I'm reading 14.8 , feel like a dumbass ,but I appreciate all the information ,thank you .I'm sure i'll have a lot more questions the more I dig it to this jeep.
     
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