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  1. #1
    Tedcfitz's Avatar
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    12 Volt Low Warning - Need Help

    Hey guys, my 2009 RXP engine (160 hours) just started showing the "12 volt low" warning. I want to troubleshoot so first I checked the battery connections. All were tight.

    Next, I want to test with a volt meter. Can someone please tell me the correct way to do this on a 4 tec? Thanks.


  2. #2
    Tedcfitz's Avatar
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    How do I correctly use a volt meter to test to see if the battery is charging? Anyone???

  3. #3
    brendanm's Avatar
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    You should have around 14v across the battery with it running. Make sure you check the main 40amp fuses and holders, mine gave this warning as the holders were corroded, replaced them and all good again.

  4. #4

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    Quote Originally Posted by Tedcfitz View Post
    Hey guys, my 2009 RXP engine (160 hours) just started showing the "12 volt low" warning. I want to troubleshoot so first I checked the battery connections. All were tight.

    Next, I want to test with a volt meter. Can someone please tell me the correct way to do this on a 4 tec? Thanks.
    Could be the battery itself...if it`s the original one. I was getting the 12 volt low warning earlier this year. Everything checked out with testing....so i replaced the battery and it`s been okay since.

  5. #5

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    Quote Originally Posted by heckie View Post
    Quote Originally Posted by Tedcfitz View Post
    Hey guys, my 2009 RXP engine (160 hours) just started showing the "12 volt low" warning. I want to troubleshoot so first I checked the battery connections. All were tight.

    Next, I want to test with a volt meter. Can someone please tell me the correct way to do this on a 4 tec? Thanks.
    Could be the battery itself...if it`s the original one. I was getting the 12 volt low warning earlier this year. Everything checked out with testing....so i replaced the battery and it`s been okay since.
    +1
    We've run into this before-- battery charging voltage OK, then after running a bit low voltage alarm. These engines' stators (not quite an alternator or generator) don't produce enough juice to run without a battery being in full working mode. A weak battery will show good charging voltage, but it will quickly become weak with running and cause the low voltage light or cause the engine to run poorly.

    If charging voltage at the battery is OK, then try a new battery.

  6. #6
    Tedcfitz's Avatar
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    Tested with Voltmeter: Showed 12v without engine running. Meter showed same 12v reading with engine running, meter showed no change with engine revving.

    How do I tell if it is regulator or stator?

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