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  1. #1

    1996 polaris slt 780 bilge pump runs all the time

    Just connected the battery and the bilge pump kept running even though the jet ski was not running. No button so I have no idea why this is happening...please help!!


  2. #2
    BlueFishCrisis's Avatar
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    Assuming this condition didn't exist before connecting the battery...

    The bilge pump is powered via the LR module in the electrical box. The LR module receives a signal via the yellow stator wire to turn the orange power feed on and off. The LR module could fail in the closed position leaving power to the bilge pump full time. Obviously this will kill your battery and needs corrected. Disconnect the battery, open up your electrical box and perform a continuity test from the red/purple to the orange wire with everything in place. If you have continuity, or partial continuity, the LR module is bad. Replace with a known good unit.

  3. #3
    Oh I also forgot to add that when the bilge pump is running with the engine off it seems to be barely running, like half speed or less. Would a failed LR module cause this or could it be the voltage regulator/rectifier?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by yooper-kzoo View Post
    Oh I also forgot to add that when the bilge pump is running with the engine off it seems to be barely running, like half speed or less. Would a failed LR module cause this or could it be the voltage regulator/rectifier?
    The LR module is the voltage regulator and rectifier module.

    Yes, a failed LR module could cause the bilge pump to run with partial voltage.

  5. #5
    Alright well I just ordered a module so ill post the results once I get it in the mail. Thanks so much for the help!

  6. #6
    Could I use the jet ski even with the bad LR unit for a day? I rebuilt the top end and want to break it in. I dont mind it running all the time when the battery is connected as I just want to break it in and install the new LR unit once it arrives

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by yooper-kzoo View Post
    Could I use the jet ski even with the bad LR unit for a day? I rebuilt the top end and want to break it in. I dont mind it running all the time when the battery is connected as I just want to break it in and install the new LR unit once it arrives
    Is the battery charging when the engine is running?

    Connect a multimeter to the battery posts. Start engine. Battery voltage should rise to above 13.5 volts if charging system is working. Charging voltage should be stable as engine RPM varies, typically somewhere near 14.5 volts.

    If battery voltage stays below 13.0 volts with engine running then there is no charging, the engine is running just on battery power.

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