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Need advice on a 97 GMC Plow Trk

Discussion in 'Truck & Equipment Repair' started by JoeB, Dec 2, 2007.

  1. JoeB

    JoeB Junior Member
    Messages: 6

    I sent a crew out last night and the 97 GMC worked great until they were 2-1/2 hrs. into plowing. (Residential driveways)

    Here's what happened. Everytime the plow was lowered, the lights would dim and when the plow was raised, the truck died. I had to pull it off the road - tried it later and it worked fine.

    Anyone know what I should check first. More snow is predicted for Tuesday.
     
  2. DJ Contracting

    DJ Contracting PlowSite.com Addict
    Messages: 1,392

    Drawing to many amps it's killing your battery when using the plow, check your alternator and if poss. upgrade.
     
  3. JoeB

    JoeB Junior Member
    Messages: 6

    Will do - thanks.
     
  4. DJ Contracting

    DJ Contracting PlowSite.com Addict
    Messages: 1,392

    I forgot to tell you to check the plow motor too as this cloud be the problem more so than the alternator.
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    What kind of plow Joe?

    It might dim the lights when you raise it but it should never dim them when lowering the blade. The "lower" valve/coil assembly only draws a few amps and definitely shouldn't draw so much on the electrical system that it causes the lights to dim... sound's more like you have a direct short in the control harness.. might want to check that one out ASAP.
     
  6. JoeB

    JoeB Junior Member
    Messages: 6


    It's an older Western and I haven't gotten to it yet. Initially thought I had a short so will definitely check the harness out also. Whatever the problem is, after it cools down, it operates fine.