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Help with wiring for a 94 chevy

Discussion in 'Fisher Engineering Discussion' started by Homer_MrPlowman, Dec 16, 2007.

  1. Homer_MrPlowman

    Homer_MrPlowman Junior Member
    Messages: 5

    I don't know if this is a better place to put this question, I had it in the Chevy truck section.

    I need help with wiring for a Fisher minute mount w/ISO box Headlight Harness #'s for 94/K2500 H3/H4... Here are the #'s I have and following will be the problems I'm having...

    Isolation module is service p/n 27779 or p/n 27781
    #1 harness service p/n 26345 or p/n 22415
    #2 harness service p/n 26357
    #3 harness service p/n 26361 or p/n 26289
    #4 harness service p/n 26369 or p/n 26387

    This was supposed to be the right harness for the truck so I was told...
    We hooked it up and the high beams stay on in low or high. I disconnected the passenger side high beam from the harness and then had high and low but only have high on the drivers side and low on the passenger side... We checked and it is not sending voltage out to the plow lights in the harness. It is a 11 pin harness wth the 3 pin making it a 3 plug setup.

    Trying to find out if one of the harnesses is wrong or if the isolation module is wrong or bad or .... help

    It is a 1994 Chevy, K2500 with H3/H4 4 headlight system It is a 6.5 Turbo Diesel hope this is enough info.
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  2. Homer_MrPlowman

    Homer_MrPlowman Junior Member
    Messages: 5

    I think they gave me the wrong ISO Mod and both #3 and #4 harness
    Mod should be 26400 Yellow not the lt green I have
    #3 26351
    #4 26352
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Look's like you found the answer on your own, as your current numbers are correct.
  4. saber7

    saber7 Junior Member
    Messages: 21

    Could you tell me where you got your harness part numbers from ? I'm also having problems hook up a harness that was"supposed" to fit.