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Peterbilt 387 reverse light

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by David387, Nov 25, 2019.

  1. Nov 25, 2019 #1
    David387

    David387 Bobtail Member

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    Aug 23, 2018
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    2011 peterbilt 387
    Eaton fuller 10 speed automatic transmission


    Recently had clutch changed and now dont have any reverse lights

    I changed out the reverse light switch on top of transmission. Still nothing.

    I have no power anywhere in wiring from switch back. Changed out the switch 3 times and still nothing.

    I’m at a loss at this point.
    Any ideas
     
    David387, Nov 25, 2019
    David387, Nov 25, 2019
    #1
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  3. Nov 25, 2019 #2
    Goodysnap

    Goodysnap Road Train Member

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    Maybe the key was accidentally turned on during the clutch change and the wiring was shorted , blew the fuse. You should have power to one side of the switch Key on. Check all fuses. If you need help tracing upstream please post VIN.
     
    Goodysnap, Nov 25, 2019
    Goodysnap, Nov 25, 2019
    #2
    spsauerland and pushbroom Thank this.
  4. Nov 25, 2019 #3
    David387

    David387 Bobtail Member

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    Aug 23, 2018
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    Checked and double checked fuses. Only fuse I can find is in passenger side box that says back lights if I remember correctly. Fuse looked good but changed anyway. That’s what lead me to think it was switch on transmission.

    vin 1XP7D49X7BD125923
     
    David387, Nov 25, 2019
    David387, Nov 25, 2019
    #3
  5. Nov 26, 2019 #4
    Goodysnap

    Goodysnap Road Train Member

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    Hopefully this will help.

    I would start by giving the wiring a shakedown and pull test in the area of the last repair. Most wiring issues are found outside the cab.
     

    Attached Files:

    Goodysnap, Nov 26, 2019
    Goodysnap, Nov 26, 2019
    #4
    pushbroom and spsauerland Thank this.
  6. Nov 26, 2019 #6
    rmankid

    rmankid Bobtail Member

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    Mar 21, 2016
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    I found a wiring diagram that shows the reverse lamps being powered through a relay. Both the coil and load side of the relay are powered through a 15 amp fuse. The coil side of the relay is tripped by an output from the transmission, this would have to provide a ground for the coil to switch. I'd start by searching for a "reverse lamp relay" and sort out what you have at that location. Hope this helps.
     
    rmankid, Nov 26, 2019
    rmankid, Nov 26, 2019
    #6
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