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Overcharging Alternator

Discussion in 'Ocean Yacht' started by alvareza, Jul 6, 2023.

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  1. Capt Ralph, Jul 12, 2023
    #21
    Capt Ralph

    Capt Ralph Senior Member

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    Location:
    Satsuma, FL
    You had the jumper in or out between B+ and sense AND original wire to the helm?
  2. alvareza, Jul 12, 2023
    #22
    alvareza

    alvareza Senior Member

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    Location:
    Scituate MA
    Jumper was out…
  3. Capt Ralph, Jul 12, 2023
    #23
    Capt Ralph

    Capt Ralph Senior Member

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    Then your alternator may have already been internally strapped. With the wire cut, alt was charging?
  4. alvareza, Jul 13, 2023
    #24
    alvareza

    alvareza Senior Member

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    Location:
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    I did not run it afterwards. When I cut the wire the engine stopped. This morning I wired it back to the way it was before. Line going to engine power on switch at the helm to battery sense terminal and the sense wire going to the opposite side battery. Crazy, I know, just trying to go back to what was working.

    I decided to see if the engine power on/off switch at the helm was was perhaps bad. I powered up the engines on the main panel. Port engine switch works fine. Turn on lights up MTU gauge. Start engine. Turn off Port switch engine turns off.

    STBD on/off switch was not having any effect on the STBD engine panel. I pulled the switch and tried pulling out the blade connections, one, the other and both. So, I think the switch is not my issue.

    Wondering if the new alternator is energizing the battery sense terminal? No strap on the alternator.

    I know I should not turn off the battery switch while the engine is running. Is it safe to power off the ignition circuits at the main panel while it is running?
  5. alvareza, Jul 13, 2023
    #25
    alvareza

    alvareza Senior Member

    Joined:
    Aug 20, 2010
    Messages:
    145
    Location:
    Scituate MA
    Your question got me thinking. I disconnected the wire I cut. Engine now starts, runs and is charging at 14.5v. And it turns off when I turn the switch off. How or why IDK.

    Port alternator seems to not be charging. Helm shows 13.1v. Thinking I’ll disconnect the same wire from it.

    Some day I’m going to draw a diagram of how this boat is wired…
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