Kohler Command voltage regulator question - Help

Discussion in 'Mechanic and Repair' started by Jason Pallas, Jul 30, 2011.

  1. Jason Pallas

    Jason Pallas LawnSite Bronze Member
    Posts: 1,325

    Kohler Command 20hp 15amp voltage regulator -

    I had two of these go in one day - on different machines. I haven't blown one up in 10 years. Nothing is different - haven't made any adjustments or changes to these machines (exmarks). Anyone have any ideas on why they blow? Just thought it was very odd. What usually causes these to blow anyway?

    I just want to make sure that I treat the problem and not the symptom - thanks!
     
  2. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,104

    Are you sure it is not the battery? This heat will kill a battery fast. Remove the battery and put a charger and charge this up and then put the batteries back and check the voltage output.
    By the way the voltage regulator will not put out if it does not get a minimum of 6 volts from the battery. If the battery is 100% dead the voltage regulator will not switch on
     
  3. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    jump starting another piece of equipment can fry the regulator
     
  4. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    Invest a few bucks in a 12 rechargeable battery pack for jump starting.

    I've replace two charging coils on briggs that were fried to a crisp--- jump started from a running pick up. Most small engine charging systems are under 20 amp systems. When you back feed the small engine from a 65 amp pickup alternator, bad things happen.
     
  5. pugs

    pugs LawnSite Gold Member
    Posts: 3,018

    Or dont have the vehicle running when jumping.
     
  6. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    Yeah, I intended to add that Pugs--of course right at the time I hit submit. I knew someone would come by and clean up. Thanks
     
  7. Jason Pallas

    Jason Pallas LawnSite Bronze Member
    Posts: 1,325

    Thanks guys! I think I may have contributed to the issue by using a higher amp fuse than I probably should have. I put a 30amp fuse in the system when I believe I should have used a 20 amp (charging system is 15amp). A friend explained to me how this may have caused the problem.... however, that only explains one mower. I still have yet to figure out what may have happened with the other. Heat maybe ?
     

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