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light problem

Discussion in 'Western Plows Discussion' started by cartails, Jan 13, 2013.

  1. cartails

    cartails Junior Member
    Messages: 2

    I'm new to this. I had a gmc 2000 unimount installed on 2004 gmc 2500 hd. all works well except both the lights on truck and plow are on at same time when plugged in. Can I just put a switch somewhere to cure the problem?
     
  2. snowplowparts

    snowplowparts Inactive
    Messages: 67

    Hooked up properly you dont need an extra switch provided all wiring
    is OEM. You or someone else needs to follow the wiring diagram and check.
    It may be simple as a bad light relay. Its rather easy to check with the schematic and a
    light tester.
     
  3. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,001

    Are they the same lights as you 2000?? Do you have drls?
     
  4. snowplowparts

    snowplowparts Inactive
    Messages: 67

    CARTAILS, i forgot to mention that the light harness 6 relay system from the 2000
    is NOT correct for your 2004.

    (I dont"t know if you purchased the correct light harness for your 2004.)
     
  5. snowplowparts

    snowplowparts Inactive
    Messages: 67

    Here is the schematic,
    click the document below.
     

    Attached Files:

  6. cartails

    cartails Junior Member
    Messages: 2

    The guy that hooked it up used the old harness and said he would make it work. All works except for plow and truc lights on at same time.
     
  7. snowplowparts

    snowplowparts Inactive
    Messages: 67

    Obviously he could't make it work, and that's why
    Western has a different light harness.
    Its not alot of money to do it the right way.
    We always recommend to hook everything the FACTORY way so there
    are no problems now and down the road.

    Its a waste of time to rigg something that's not going to be correct.
    Is he going to replace your vehicle electrical harness when it fried out because
    the drivers that handle the electric distribution were overcome?

    I would hate to hear that happening to you.
    The part# is 64075, you would also need a few other small items.
    If your interested i can supply you all the part#s and your discretion were to buy.
    Pm if your interested, Thank you SPW.ussmileyflag
     
  8. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,993

    You do not need to buy new harnesses just change your configuration

    here's pictures

    http://www.plowsite.com/showthread.php?t=89741&highlight=re-pin

    Pages 8 and 9 show you the two different configurations, change what you have to match what you need.

    http://library.westernplows.com/westernplows/pdf/64127_103103.pdf
     
  9. twinman326

    twinman326 PlowSite.com Addict
    Messages: 1,683

    I believe they did change the wiring around in the early 2000. Use to have neg ground then went to pos ground. In the light configuration, you need to flip the pins around
     
  10. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,001

    You mean neg switched right? Not pos ground??
    And its a unimount ..relays only no ISO module
     
  11. twinman326

    twinman326 PlowSite.com Addict
    Messages: 1,683

    I meant the year of the vehicle. I believe GM switch their wiring around somewhere in the early 2000.
     
  12. twinman326

    twinman326 PlowSite.com Addict
    Messages: 1,683

    A) 2000 Gmc what?

    B) how many relays do you have?

    C) Does the vehicle have DRL (daytime running lights)?

    D) what color wires do you have plug into the headlights?

    E) 9 or 12 pin harness?

    What be wrong , the relays might be wire wrong.
     
    Last edited: Jan 14, 2013