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Lights on a 7-6 MM2

Discussion in 'Fisher Engineering Discussion' started by Richmor52, Sep 1, 2012.

  1. Richmor52

    Richmor52 Junior Member
    Messages: 17

    I have a MM2 on a 2003 Chevy 2500HD 6.0L, my question is that I have no marker lights or turn signals. I also have a problem with my head lights, I believe it to be a problem with the ground because one is brighter than the other and when I play with the harness I can get it to work normally. My big issue is with the markers and turn signals. Is there a fuse somwhere I can replace because when i went to replace one of the bulbs all the light stopped working. The bulbs have'nt blown and the lights on the truck still work normally. Thanks Kyle
     
    Last edited: Sep 1, 2012
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,968

    Ck the main gnd tk to plow and grill to plow. Ck fishers website for the wiring diag
     
  3. Richmor52

    Richmor52 Junior Member
    Messages: 17

    Think it may be a fuse on the truck.
     
  4. buddymanzpop

    buddymanzpop Senior Member
    Messages: 599

    Is this a new install or have the directional and markers been working before and now are not working?
     
  5. Richmor52

    Richmor52 Junior Member
    Messages: 17

    The markers and turn signals originally worked. It's almost like I shorted somthing out, when i went to replace the one of the bulbs all the lights, markers/ turn signals, stopped working.
     
  6. buddymanzpop

    buddymanzpop Senior Member
    Messages: 599

    Start by checking the connections at the grille plugs to make sure both sides are clean, then make sure the black/orange stripe wire at the ground (neg) stud on the motor has a clean connection and no breaks and then check the splices at the vehicle harness for good connections
     
  7. Richmor52

    Richmor52 Junior Member
    Messages: 17

    Just to confirm there are no fuses on the vehicle side of the harness. When the light stopped working was when I pluged the new bulb in as if I had blown a fuse. Thanks for the help Kyle
     
  8. Richmor52

    Richmor52 Junior Member
    Messages: 17

    What started all the problems, went to replace the two broken 1157 bulbs and while installing the bottom bulb no more markers. Nothing inside the housing broke only thing that broke were the two bulbs and the headlamp.

    388646_317124071649828_1347676358_n.jpg
     
  9. buddymanzpop

    buddymanzpop Senior Member
    Messages: 599

    On the main control harness coming out of the #1 port on your isolation module you will most likely find a 15 amp fuse blown, it's for the markers and turn signals, when you broke the bulb you probably shorted it to ground and popped that fuse, by the way the other 7.5 amp fuse is for the controller.