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Wiring issue with a 1999 Pete 378

Discussion in 'Peterbilt Forum' started by easley6, Apr 21, 2013.

  1. Apr 21, 2013 #1
    easley6

    easley6 Bobtail Member

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    Apr 20, 2013
    0
    I have a problem with a 1999 pete 378 .When the key is turned on the radio and engine fan light comes on,but no warning lights or acc relay or engine ecm but starter turns but truck won't crank.
     
    easley6, Apr 21, 2013
    easley6, Apr 21, 2013
    #1
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  3. Apr 21, 2013 #2
    truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
    0
    Acessory relay behind the dash or the fuse on the righthand side of tge fuse box,if you have the old 3 panel dash the relay is behind the small panel on the left mounted to the dash support if the next series dash its behind the panel with the ign switch in it also mounted to the dash structure.there is also a breaker in the fuse panel at the bottom that could be tripped
     
    truckmechanic, Apr 21, 2013
    truckmechanic, Apr 21, 2013
    #2
  4. Apr 21, 2013 #3
    easley6

    easley6 Bobtail Member

    3
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    Apr 20, 2013
    0
    All that you mentioned has been checked with no results. When you turn engine fan switch on it will backfeed to the relay 12v. Any other suggestions would be appreciated.
    David
     
    easley6, Apr 21, 2013
    easley6, Apr 21, 2013
    #3
  5. Apr 26, 2013 #4
    bubbanbrenda

    bubbanbrenda Road Train Member

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    Feb 27, 2011
    Middletown,Oh.
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    Check the ECM power wires in the battery box. No pre-check lights = no ECM power.
     
    bubbanbrenda, Apr 26, 2013
    bubbanbrenda, Apr 26, 2013
    #4
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