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fisher mm 3 port iso problem

Discussion in 'Truck & Equipment Repair' started by spartagr, Dec 28, 2014.

  1. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    just installed a fisher 3 port iso green 29070-1 on an 04 chevy suburban to run a mm1 3 plug straight blade.. got everything connected and i get no lights and no power. can anyone tell me where I might have gone wrong? or maybe its the wrong iso? any help.. thank you
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,966

    Fuses....And plow is hooked up and plugged in while you're cking this right?
    Parking lights and turn signal inop as well?
     
  3. spartagr

    spartagr Junior Member
    from NY
    Messages: 26


    Right. Hooked plow up, nothing working
     
  4. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,652

    Make sure the small red wire going to solenoid's large terminal is on the battery side.
     
  5. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    Ok ill check it. I'm almost sure it is. I hooked everything up like the diagram in the book.
     
  6. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,652

    The other thing to check is that the ignition accessory wire is getting a full 12v when the key is turned on.
     
  7. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    Ok I'll check that too. I do have the correct set up for my vehicle right?
     
  8. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,652

    Only thing that is really vehicle specific is mount and light harness. If mount bolted up and harness plugged in I would guess everything is correct.
     
  9. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,966

    That might not matter for right this minute.
     
  10. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    Ok I'll check those couple wires tomorrow and see what happens. Thanks for helping
     
  11. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    Ok so 1 problem was the small red wire not secure in fuse panel. Now I have power. But no lights. I have not yet spliced in the turn signal wires. Will that cause the lights to not work. The truck lights go out but plow lights don't turn on.
     
  12. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,652

    Not sure since never tried lights without park and turn spliced in. Suggest finish the install then try lights again.
     
  13. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,966

    I'll say yes, need you to hook up the parking lights
     
  14. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,412

    The parking light circuit is what switches the high and low beam relays in the isolation module. So, you do need at least the parking lamp wire from the plug-in harness to be spliced into the vehicle's parking lamp circuit, or the lights will not switch from truck to plow when the plow is plugged in. Being that you say the truck lights go out, but the plow lights do not come on, you also need to confirm correct orientation of the vehicle headlamp plugs (all four) where they plug into the plug-in harness... The negative (grounded) wire on each plug should orient with the wire marked "COM" on each plug on the plug-in harness. This configures the harness connections for the proper headlamp common... which, in the case of your vehicle, is negative.
     
  15. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    The harness had grey and black plugs. I'm assuming that grey goes to grey and black to black. I think grey is low beam and black is high beam.
     
  16. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,412

    That's correct. However, the plugs will plug into the plug-in harness in either direction, but they are only correctly oriented in one direction, and will not function if not oriented correctly. The harness is universal for vehicles with negative common and positive common to the headlamps. Yours is negative common.
     
  17. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    Ok I'll double check that. Thanks for your help
     
  18. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    Ok so now I have lights working on the plow, blinkers working, but no parking lights on plow. Any ideas?
     
  19. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,966

    And you did this correct?
     
  20. spartagr

    spartagr Junior Member
    from NY
    Messages: 26

    I believe so. Green wires labeled park turn on pass side. Spliced into parking light on vehicle. Blue wire on driver side to parking light on vehicle