Peterbilt 387 electrical problem help

Discussion in 'Trucks [ Eighteen Wheelers ]' started by speeedy, Aug 25, 2013.

  1. speeedy

    speeedy Light Load Member

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    Feb 16, 2013
    miami FL
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    so I was driving everything was great temperatures were fine all of a sudden I lose all electrical power the only thing that was still working was the four ways. Does anyone have any idea where to check I called my mechanic he says it might be a loose wire but I have no idea where to start looking. I lost power to the dash headlights and engine about a minute later they got power again and it started back up with no problem has this happened to anyone here? Do you have any ideas where to start looking for this issue I have a caterpillar c15. I would appreciate any help or any ideas I checked all the wires on the battery they are tight I check the wires on the fuse box all the pins are in tight anybody else got any ideas?
     
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  3. Fatone

    Fatone Bobtail Member

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    3
    Jul 11, 2013
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    Check where the + battery cables join together on the starter for good connection.Also check where the - cables join together on the engine block or starter.
     
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  4. ahmadali04

    ahmadali04 Bobtail Member

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    Jan 30, 2011
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    I had a similar issue on one of my 387's. I turned out to be a broken ground cable connecter under the sleeper of the truck. You may want to check that, if all other grounds are okay.
     
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  5. I agree. Check the starter bolts for any loose cables. Check all grounds. As well as your block of large fuses in the battery box. And your batteries. Start at your sources of power. Also check the wire coming from the alternator/ generator. I have a 387 if you need any help yell.
     
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  6. Blind Driver

    Blind Driver Road Train Member

    3,080
    1,403
    Aug 7, 2006
    New Albany, IN
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    Be sure the 3 small connectors at the batteries are connected. One or more of these supplies juice to the ECM.

    In my experiences, it's almost always a bad ground.
     
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  7. speeedy

    speeedy Light Load Member

    150
    25
    Feb 16, 2013
    miami FL
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    Thanks fellers will report outcome by tommorow night
     
  8. speeedy

    speeedy Light Load Member

    150
    25
    Feb 16, 2013
    miami FL
    0
    well I ran hey secondary ground wire from the chassis to the cab haven't had a problem yet thank you guys so much you truly are lifesavers
     
  9. I have found the wire diagram for a 2005 Peterbilt 387. In PDF format. About time.
     
  10. Dino1968

    Dino1968 Light Load Member

    That would be a great thing to have !!!!! Any links or something ?
     
  11. Eustace

    Eustace Bobtail Member

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    Jan 28, 2014
    0
    ............ I had a similar problem with a 386 a while back, turned out to be alternator was overcharging and cab controller shut almost everything down in cab, not saying that is the problem but might be something to keep in mind.
     
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