Voltage Regulator problems

Discussion in 'Mechanic and Repair' started by cariboulou, Apr 21, 2013.

  1. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    Been doing a little online research and my battery on my 25hp kawi wasnt getting charged. I measured 36 volt ac from stator so I assumed it was voltage regulator. $50 later I installed but the one screw that help it tight to engine shroud was stripped a little so it wasnt very tight like when I removed it.
    Well now problem is happening again, had to jump start and while it was running measured 13.4v dc on battery when it was running and then only 12.3 volt dc when engine off at battery terminals. I removed regulator and help it tight to shroud while starting.....saw some sparks between back of reguator and shroud. Now it seems like regulator has quit again? Could the regulator be so sensitive
    it fried? its only a week old!

    How important is a contact ground on the back of this thing?
  2. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,337

    You found the problem....the regulator wont work if it doesnt have a good ground ..
    Doubt that it is fried...clean the mounting area and tighten the regulator...
    Maybe...even run a separate wire from the case to ground..
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I agree with Slapper, Good ground is important..... If the mount screw holes are stripped remove the cover and drill out, Then mount the regulator with screws and nyloc nuts putting the screw heads inside, Add a 14ga wire to one of the regulator mount screws then run to a cover mount screw in the block......
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,337

    I have to agree with you agreeing with me...:weightlifter:
  5. pugs

    pugs LawnSite Gold Member
    Messages: 3,025

    While you are doing all of this also make sure you are getting battery voltage at the single wire coming from the machine to the regulator. Check voltage at the battery and then at that wire. Should be very close. If not start checking the wiring on the machine. This would be with engine off and key on.

    I have sold a number of Kawasaki regulators to people, but I rarely ever put one on in the shop. Usually its a wiring problem on between the engine and battery.

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