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no high beams on truck

Discussion in 'Truck & Equipment Repair' started by Eboucher, Feb 9, 2016.

  1. Eboucher

    Eboucher Junior Member
    Messages: 25

    Hi all, i have a unique issue...

    after plowing this weekend all was well, i dropped the blade after the storm and went on my merry way. tonight i went to turn on my high beams and i have nothing. low beams work fine. when i got home i plugged the plow back in and i have high and low beams. i swapped relays and both high and low relays are good. i have not yet bypassed the isolation module to isolate the issue, but any ideas?

    im running a 2005 GMC Sierra 2500hd, has the factory plow prep package, 4 port isolation module.

    everything was running good up until this past storm.

    any input would be appreciated.
     
  2. Eboucher

    Eboucher Junior Member
    Messages: 25

    also want to add, i had lost the ground on the solenoids yesterday. the three were daisy-chained together but the wire broke where it connected to the harness. is it possible it tired to ground out through the lighting harness?


    adding:

    checked the two fuses and the fuses in the harness are good,
    you can hear the high beam relay click when you turn it on, but no light...
    i have also swapped the high and low beams at the bulbs to make sure by some freak issue both bulbs died.
     
    Last edited: Feb 9, 2016
  3. Randall Ave

    Randall Ave PlowSite.com Addict
    Messages: 1,971

    Ask the mod to move this to the Western thread. You will get more responses.
     
  4. Eboucher

    Eboucher Junior Member
    Messages: 25

    are the western and fisher modules the same?

    i guess i forgot to add its a fisher MM2 4 port module..