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Western Pro Plow Unimount No Lift / Angle. Loss of Power

Discussion in 'Western Plows Discussion' started by Massimo, Mar 9, 2016.

  1. Massimo

    Massimo Junior Member
    Messages: 9

    Hi. I have an older Western Pro Plow Unimount and just started to have this problem this year. It was intermittent, now it is constant.

    When I lower the plow it lowers properly. When I raise or angle it, the LED light on the handheld controller dims and the plow does not respond. Occasionally the light will turn off completely and I will lose all power to the plow. I have to wait a while with the truck off for it to turn back on. I noticed today that one of the Siemens vf4-15f11-c01 relays was clicking very fast, almost buzzing. I'm thinking that the relay is bad so I will buy another one today (assuming I can find one). I have replaced the solenoid and checked all wiring connections including verifying the ground. Anything else you can think of that I should try?

    Thanks in advance
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,391

    Ck where your controller power is plugged in.under the dash, also the controller fuse has been an issue for some of our trucks in the past so I just replaced the glass holder to a mini blade style
    Is it a 5 pin relay your talking about?
    Last edited: Mar 9, 2016
  3. Randall Ave

    Randall Ave PlowSite Veteran
    Messages: 3,586

    Throw in the year, make, model truck. Some have common failures.
  4. Massimo

    Massimo Junior Member
    Messages: 9

    2002 Chevy Silverado K1500. Never seen a garage, so rust is an issue.
  5. Randall Ave

    Randall Ave PlowSite Veteran
    Messages: 3,586

    A buzzing relay can be pointing to bad grounds. Clean them all. The relays only work the head lamps. You need to get in there with a test light, and a volt meter. Look for voltage drops.
  6. Massimo

    Massimo Junior Member
    Messages: 9


    A bad ground or solenoid was my first instinct. The solenoid was replaced so it rules that out. I was out there messing with it and it just made sense that it was a bad ground so I checked that they were all tight and not corroded. Then I had the brilliant idea of spinning the ground around the battery post. It worked. There must have been corrosion between the post and connector. Tomorrow I will take it off and clean it properly.

    Thank you all for your help and attention. It is truly appreciated!
  7. Philbilly2

    Philbilly2 PlowSite Veteran
    Messages: 3,787

    And "Bad Ground for $800" wins it again!
  8. to_buy

    to_buy Senior Member
    Messages: 278

    I will take bad ground for $600, use a meter not a test light
  9. Philbilly2

    Philbilly2 PlowSite Veteran
    Messages: 3,787

    What is: "An easy way to find the missing link in the connection?"

    Bad ground for $400 please