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  1. #11
    Join Date
    May 2018
    Posts
    4,930

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    Measured with charger unplugged

    Bat1 on: 0.147v
    Bat2 on: 0.147v
    Bat off: 0v
    Charger on: 0.154v

    Definitely the boat ground, just don't know if this is normal.


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    2021 Supra SA 400
    2018 Supra SA 400 (SOLD)
    Michigan

  2. #12
    Join Date
    Jan 2021
    Location
    Columbus, Ohio
    Posts
    1,256

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    0.15V on a fiberglass insulated boat is hardly nothing. However, leave your switch on and your battery(s) will be dead in a month.

    I wonder if you have a loose ground wire from the batteries to the bus bars. 2yr old boat might have had a bolt vibrate loose. I have had 1.5 loose turns on a car battery ground prevent it from starting.
    2015 Moomba Mojo Surf Edition
    4,000lbs
    Manual Flow

  3. #13
    Join Date
    May 2018
    Posts
    4,930

    Default

    Quote Originally Posted by Holdmybeer View Post
    0.15V on a fiberglass insulated boat is hardly nothing. However, leave your switch on and your battery(s) will be dead in a month.

    I wonder if you have a loose ground wire from the batteries to the bus bars. 2yr old boat might have had a bolt vibrate loose. I have had 1.5 loose turns on a car battery ground prevent it from starting.
    Switch is always off in barn. But I will start chasing loose connections


    Sent from my iPhone using Tapatalk
    2021 Supra SA 400
    2018 Supra SA 400 (SOLD)
    Michigan

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