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blows 7.5 fues

Discussion in 'Western Plows Discussion' started by hunter72359, Dec 2, 2012.

  1. hunter72359

    hunter72359 Junior Member
    Messages: 4

    blows 7.5 fues when going up or down only
    left to right is fine
     
  2. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    What fuse? Headlights, Transmission, Plow maybe? C'mon dude, you have to tell us what kind of plow you have. Uni, Ultra, convention cable operated, two wires at the grill, three wires, straight blade, V, Wide-out? Relays or isolation module, new fleet-flex or the old style. Tell us about it. There are so many different possibilities.

    I will take a guess at the probabilaty that is is a late model plow with isolation module, either three or four port. They both have 7.5 A fuses.
     
  3. hunter72359

    hunter72359 Junior Member
    Messages: 4

    blow 7.5 fues

    ultra mount 8 foot pro plow straight blade with isolation module
    its only blow the fues if you go up or down
    the fues is for the power to the control
    3 wire at the grill
    4 port
     
    Last edited: Dec 2, 2012
  4. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    That's much better, now we know what we are dealing with. That fuse feeds the controller with the power that is sent to the valve coils. It goes through the isolation module first though so it could be a bad module. What is interesting is that you say it blows for up and down. I would have directed you to try moving coils around from valve to valve (but not the wires) to see if we can isolate a shorted coil. But up and down use two different coils one of which is active when angleing too. Now I am thinking it is probably something in the handheld controller. Do you have the opportunity to try a different controller without buying one? Borrow from a friend or ask you dealer if they will let you try one? That would be the first thing to eliminate.
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    When the Iso's short out on the control power circuits (internally) they pop fuses as soon as the ignition is cycled on. Isn't effected only on specific functions either.



    1) Control harness shorted to ground (firewall pass through or any other sharp area it's near)
    2) Faulty controller or harness at the controller.

    That's basically it. Move the harness around (slightly relocate it) while carefully looking for any locations it's worn through.
     
  6. hunter72359

    hunter72359 Junior Member
    Messages: 4

    blow 7.5 fues

    to day try different control it olny blows it going down as soon as you push the down its blows
     
  7. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    Perhaps it's time to have a look under the valve cover for pinched wires. If the wires are good you could try testing the S1 coil. That is the coil closest to the front of the vehicle / plow. Not sure what resistance it should have but you can compare it to one of the other coils. If you have a current probe you could just hook it up to a 12V battery and see how much current it draws. Sounds like the coil could be shorted internally causing it to pull too much current. A pinched wire touching ground would do the same thing. If it is only happening when you hit the down button it makes it much easier to trace.
     
  8. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Quick test to rule out a shorted S1 coil. Pull the control wire off it and hit the lower/float command. If it still blows fuses then of course it isn't the coil.

    Hardly ever see shorted coils but it can happen. A short in the control harness/grill plug is far more common.
     
  9. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    Yes, pulling the wire off would be an effective test. At the same time you can look if any wires are pinched under the vavle cover, which is possible too.
     
  10. hunter72359

    hunter72359 Junior Member
    Messages: 4

    work on it today found out the wire to the coil was ground out on the frame fix it working fine thanks for your help