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  1. #1

    150msx battery not being charged and blowing 20amp stator fuse

    My battery is not being charged. Service manual says i should have 14vdc on the battery with eng running i only have 12.4vdc. Changed battery no help. Than i noticed that the 30amp stator fuse was blown. Replaced it and blew again. It runs fine and i can get a few hours on the battery but then the battery drains and i get stuck. If anyone has any advice please help. The wiring diagram shows a simple circuit- Batery positive to Starter relay to 30A fuse to voltage regulator to alternator.


  2. #2
    correction its a 30ampr stator fuse

  3. #3
    casey67's Avatar
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    Welcome to Green Hulk.

    I imagine you need to find out which part is shorting to ground.
    Unplug the voltage regulator,using an ohmmeter test the 3 wires going to the alternater to ground,if one of them shows continuity to ground,you need an alternater.

  4. #4
    2&4strokepolaristech's Avatar
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    your voltage regulator is bad and has a dead short to ground. It is very common on these models more so on the ones in salt water. It is located under the intercooler. And yes a 30 amp mini fuse is correct.

    there are two connectors for the voltage regulator on is a two pin connector with a red and black wire and the other with three yellow wires. unplug the red and black and put in the fuse and i bet you it will not blow a fuse.

  5. #5
    thanks for the replies. Is there any way to verify that the voltage regulator is bad and if so is it difficult to change out.

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by mike2019 View Post
    ...Is there any way to verify that the voltage regulator is bad...
    Quote Originally Posted by 4strokepolaristech View Post
    your voltage regulator is bad and has a dead short to ground...
    It is located under the intercooler.

    ...there are two connectors for the voltage regulator on is a two pin connector with a red and black wire and the other with three yellow wires. unplug the red and black and put in the fuse and i bet you it will not blow a fuse.
    I think that is your answer.

  7. #7
    ph2ocraft's Avatar
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    Jay is da man, I had one that did the same thing, replace the regulator and call it a day.

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