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Light Problem on chevy.

Discussion in 'Fisher Engineering Discussion' started by murphy7185, Dec 5, 2010.

  1. murphy7185

    murphy7185 Junior Member
    Messages: 6

    We switched a min mount 1 plow from a 01 chevy to an 06 chevy. Wired everything identical. We have high beams but no low beams. We have tried every single combination with the 4 port fisher isolation module. Pin F 23401 W 26386. Pin 26135 B/D 01351. The lights on the truck not the plow will not go low beams. High beams work, blinkers everything. Any ideas?
  2. South Seneca

    South Seneca Senior Member
    Messages: 474

  3. buddymanzpop

    buddymanzpop Senior Member
    Messages: 603

    Murph, GM changed their wiring from a positive common to a negative common in 99 to 02 then back to positive common in 03, to re-use the 99 to 02 headlight harnesses in the 03 and up trucks the wiring at all the headlamp plugs must be reconfigured and a couple wires at the iso-mod plug ends must be switched, the four port module headlight harnesses are different for those years (port 3 and 4 harnesses), you can't receive personal messages yet, but if you can pm me or get your e-mail address to me I can send you the wiring reconfiguration diagrams, all you need is a pick tool and a little time 15 to 20 minutes to change the pins around.
  4. murphy7185

    murphy7185 Junior Member
    Messages: 6

    my email is ryan@ramconstructionme.com. I went to the fisher dealership local to us. I got a configuration plug. The guy to configure the configuration plug for negative common and then try that? Does that sound right?
    Last edited: Dec 6, 2010
  5. 06Sierra

    06Sierra PlowSite.com Addict
    from Maine
    Messages: 1,329

    Where the plow harness plugs into the truck headlight harness, plug it in backwards and I bet the lights will work fine. You have to take the plow side plug apart and swap the wires around. My plow was on a 2001 GMC and I put it on a 2006 and had the exact same problem.
  6. avc8130

    avc8130 Member
    Messages: 43

    Where the plow harness plugs into the vehicle light harness, configure the plugs so the yellow wires are connected on both sides.

    I had the exact same problem and was about ready to light the whole truck and plow on fire over it!
  7. South Seneca

    South Seneca Senior Member
    Messages: 474

    I hear that! I've spent a lot of time and money, only to end up with a cob job.
  8. Burkartsplow

    Burkartsplow PlowSite Veteran
    Messages: 3,246

    flip the connection to common and it will work fine.