Are your batteries posts clean? You will be amassed how fast they dirty themselves and they practically insolate the battery from the system
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Thread: Battery Solenoid or Starter
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04-26-2018 09:09 AM #11
Re: Battery Solenoid or Starter
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04-26-2018 10:46 PM #12
Re: Battery Solenoid or Starter
I went thru same thing on my boat. Specific gravity even showed all cells good except one on one battery. Terminals good, etc. Left them all unconnected for over 24 hrs and got 8.6 volts each. Still would only crank with parallel. Took them all in to load test and they all failed even the one in the series that was 2 years old. Replaced them all and the engine cranks fine every time. Not saying this is your problem but even if all the tests are passed it could still take a load test to determine. I had a thread on this around December or so