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Older 71/2ft straight, lifts but wont turn

Discussion in 'Boss Plows Discussion' started by Avitare, Nov 24, 2012.

  1. This may be a problem I had years ago,..memory plays tricks
    First day of pushing serious snow this year. All went well for about 8 big drive ways and then she would not turn either way. I can hear the pump whine and the lights dim but the plow wont move left or right. Lifted and falls fine.
    I had to finish a few more so nudged the plow to a tree to get more straight and allow me to do a few more drives.

    This seems to be a valve that is not moving as there is pump action and it does lift fine.

    I think the shop fixed this once and it was a grounding problem and that is what I am going to check first. That and electrical connections.

    please forward any suggestions
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Check/service the ground leads for the angle coils first, and if deemed 100% good then the angle valve itself needs replaced as it's damaged (bent spool).
  3. service/ground checks

    That explains the options
    I seem to recall the shop adding a ground and I will check there.
    Assuming that the supply would be 12v when the stick is activated -- thinking I either need
    to rig a meter/light to the (correct) terminals
    Is there a wiring diagram for this 1999 plow ?
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    You can check the 12v command function at each of the angle coils easily with a testlight and a helper. But you'll likely find those are fine because it isn't common to lose them both simultaneously. When you do, it's either lack of ground (since it's shared) or a faulty valve as mentioned.

    Here's the manual with diagrams-

    Attached Files:

  5. Bad Ground

    I tried to check every connection and found one wire break off -- fixed that but the end solution was to run a ground direct to the battery/black cable connection.

    This vintage (1999) jumps from one point to another and that can be risky.

    best suggestion: carry a wire with alligator clips so you can jump ground to direct black

    thanks all
  6. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    You actually did an upgrade whether you realize it or not. A dedicated lead right to the motor ground is the best way. In fact, that is how they began doing it a few years after your vintage unit and are still that way today.