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Thread: Battery volts

  1. #1
    Join Date
    Aug 2009
    Location
    Lebanon, MO
    Posts
    191
    Boat
    2014 Z3

    Battery volts

    What should fully charges batteries be at on the voltage meter. I put a new house battery in and have used the boat a few times. Voltage is showing 13.6 with nothing on. Crank battery shows 12.9-13 with key on not running. When I shut the key off it goes to 1.3. I’m getting the battery voltage low message and my stereo is only coming from front speakers which it has done in the past with ow battery issues (at least I think that’s what is causing it. Boat has been on a dual bank pro mariner charger for a couple days.


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  2. #2
    Join Date
    Aug 2015
    Location
    Salt Lake City, Utah
    Posts
    1,124
    Boat
    2017 RZX3, 2013 MB F24, 2000 21V
    Alternator voltage is 14.5, but most people don’t see that. Static voltage is 12.5 in a good battery. With the engine running and electrical items on you should see mid 13’s. If I saw less than that I would start looking into why.

    1.3 volts says something is still pulling power.

  3. #3
    Join Date
    Apr 2006
    Location
    Lake Wylie area, NC
    Age
    49
    Posts
    27,252
    Boat
    Back in the good ol' days a 2006 22ve
    You need to check the voltage AT the batteries with a hand held volt meter. Sounds like the house bank is possibly not seeing any input from the alternator or a cable is missing and its not even part of the charging circuit.
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  4. #4
    Join Date
    Aug 2009
    Location
    Lebanon, MO
    Posts
    191
    Boat
    2014 Z3
    Quote Originally Posted by chpthril View Post
    You need to check the voltage AT the batteries with a hand held volt meter. Sounds like the house bank is possibly not seeing any input from the alternator or a cable is missing and its not even part of the charging circuit.
    Finally got around to checking them at the battery. Both show 12.8 but that’s after being on the charger for 2 days then unplugged for about 6 hours.


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