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Tornado spreader surging

Discussion in 'Truck & Equipment Repair' started by stackmaster, Dec 20, 2015.

  1. stackmaster

    stackmaster Senior Member
    Messages: 107

    I have a western tornado that has a surging issue. There are two electric motors on the sander and both of them are surging. My question is could the surge be caused by my alternator?? I noticed that if I run the sander with the engine off, there is no surge. Start the truck and the surge is back. Thanks in advance for any help.
  2. Randall Ave

    Randall Ave PlowSite Veteran
    Messages: 3,593

    Put a good voltmeter on the battey, then run engine and salter, see if the voltage fluctuates.
  3. Philbilly2

    Philbilly2 PlowSite Veteran
    Messages: 3,797

    Randall is on to the right way to diagnose before you throw parts at it.

    It almost sounds like a dead cell in a battery to me. It is relying on the alternator to keep up instead of storing the power.
  4. stackmaster

    stackmaster Senior Member
    Messages: 107

    Thanks for the replies. With a voltmeter on the battery there is a minimal drop in voltage when the sander is turned on. Nothing below 13 volts though.
    Thanks again.
  5. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    Try at the sander motors as well.
  6. stackmaster

    stackmaster Senior Member
    Messages: 107

    At the motors the voltage varies big time. I believe there is a controller on the back that directs the power to the two motors. Wondering if its that.
  7. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,780

    The modules usually work or don't... if they receive a surge they're done.I'm tempted to say its your cab control.
    I would check the wires feeding into the back for contact.
  8. stackmaster

    stackmaster Senior Member
    Messages: 107

    I had this problem last year as well. Had to replace the controller in the cab because of bad contacts on the back so this is the second in cab controller with the same problem. The controller in the cab appears to be working correctly so really hoping it's not that again. $400 Canadian. Ouch
  9. bliz&hinikerDLR

    bliz&hinikerDLR Senior Member
    Messages: 553

    There was a service bulletin on those cab control rear contacts. I suggest you make your dealer prove that they filed a claim and if denied ask to have it reviewed citing the service bulletin. No reason you should have to buy one of those controls unless you physically damaged it.