Electrical short

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by dannybutton952, Oct 18, 2020.

  1. dannybutton952

    dannybutton952 Bobtail Member

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    Jun 21, 2020
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    I have a 2012 587 peterbilt. When I turn the key off the info center on the dash stays on and it's running my battery is dead every other day. Where is my first place to look for a short?
     
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  3. Goodysnap

    Goodysnap Road Train Member

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    First, are you certain the key is off and not in accessory? If the switch/tumbler is worn sometimes the key can be removed in all positions.

    I would start pulling fuses to identify the circuit or circuits staying powered up when they are supposed to be off.
     
    AModelCat and dannybutton952 Thank this.
  4. Old Man

    Old Man Road Train Member

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    Maybe the relay powering the dash is staying closed. If it’s stuck closed the key position is not a factor.
     
  5. dannybutton952

    dannybutton952 Bobtail Member

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    Jun 21, 2020
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    Where would the relay be located?
     
  6. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Try disconnecting batteries for 1/2 hour. This will sometimes reset CECU module. This module is the "brain" for your dash.
     
  7. dannybutton952

    dannybutton952 Bobtail Member

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    Jun 21, 2020
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    Thank you. I have the batteries disconnected now. So they don't draw it dead so it'll start in the morning I'll go back out in about 45 minutes ,hook them back up and see if the dash lights are still on
     
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