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Voltage Drop

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 97Peter379, Apr 7, 2023.

  1. Apr 7, 2023 #1
    97Peter379

    97Peter379 Bobtail Member

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    Apr 7, 2023
    0
    Hey guys,

    I have a 97 Pete 379 experiencing a 1v voltage drop in sync with the right turn signal. Blower motor, marker lights, headlights, brake lights also cause smaller drop in voltage.

    With the right turn signal on, the voltage drops in sync with it for about 10 seconds before clicking and no longer working. After about 10 seconds it clicks back on & will work for a shorter amount of time.

    left turn signal works perfectly and has zero drop in voltage. Any help would be appreciated! Thanks!
     
    97Peter379, Apr 7, 2023
    97Peter379, Apr 7, 2023
    #1
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  3. Apr 7, 2023 #2
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    And battery cable/battery condition is?
     
    Big Road Skateboard, Apr 7, 2023
    Big Road Skateboard, Apr 7, 2023
    #2
    Diesel Dave Thanks this.
  4. Apr 7, 2023 #3
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I had a loose cable on back of the alternator. It would drop the volt meter if I turned anything on. At first I thought it was the batteries going bad but all the cables were good as the batteries. I couldn’t figure it out until I figured the alternator was shot. So I check it and that’s when I found the loose cable.
     
    Diesel Dave, Apr 7, 2023
    Diesel Dave, Apr 7, 2023
    #3
  5. Apr 7, 2023 #4
    bad-luck

    bad-luck Road Train Member

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    I am thinking that a hot wire to one of these is grounding out. Could possibly be in on of the running lights, maybe in the turn signal.
     
    bad-luck, Apr 7, 2023
    bad-luck, Apr 7, 2023
    #4
  7. Apr 7, 2023 #5
    97Peter379

    97Peter379 Bobtail Member

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    Apr 7, 2023
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    Some battery cables were corroded on both positive and negative sides . Replaced and all is well again. Turns out something that seems really complex can have a simple solution ‍ thanks for your help
     
    97Peter379, Apr 7, 2023
    97Peter379, Apr 7, 2023
    #5
    Diesel Dave and Big Road Skateboard Thank this.
  8. Apr 7, 2023 #6
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Glad you got it figured out.
     
    Big Road Skateboard, Apr 7, 2023
    Big Road Skateboard, Apr 7, 2023
    #6
    97Peter379 Thanks this.
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