INTERMITTENT CHARGING

jhofmannjhofmann Member Posts: 430 ✭✭✭
in Electrical Discussions
2000 FV242, 5.7 Mercruiser. Last time out I watched my voltage keep dropping. When Battery #2 hit 10 volts, I switched to battery #1 and made it back. When I got home, I plugged in the onboard charger and brought both batteries back to full charge. Srarted the engine and multi-meter said altenator putting out 14.5 volts, and reading 12.5 volts at both batteries, 12.7 with motor stopped. I removed the battery isolator and did a diode test between the input and both outputs, and it passed. Put the isolator back in, and now reading 13.5 - 13.7 volts at both batteries. Is it possible for the isolator to stop working and then start working? I would love to believe it was just a bad connection, but I'm usually not that lucky!
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Comments

  • randy56randy56 Member Posts: 4,085 ✭✭✭✭✭
    You may be that lucky, bad connections on battrie's , isolator, It is a 18 year old.
    Boat Name : 

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  • Cableguy GregCableguy Greg Member Posts: 5,066 ✭✭✭✭✭
    I had a loose connection in my charging system 2 years ago. I replaced batteries and the isolator. Still the same issue. I dig deeper into it and the connection on the back of the battery breaker wasn’t tight. I changed the breaker and made sure the connections were tight and haven’t had an issue since. 
    2008 280 Express Cruiser, 6.2MPI, B3, Pittsburgh, PA "Blue Ayes" (Sold)
    2022 Cherokee 294GEBG Black Label land yacht. 
    Go Steelers!!!
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  • StodgeStodge Member Posts: 2,738 ✭✭✭✭
    Could have had some corrosion on the isolator contacts.  

    I should check all my connections next time I have time to get into the bilge.

    2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX

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