MerCruiser 8.2 big block 2014 — shuts off after 5-7 min of running

tank1949

Lieutenant Commander
Joined
Apr 4, 2013
Messages
1,911
UPDATE:
So we’ve had a decent amount of time now to go through fuses, breakers, sensors, etc. and we’ve determined that the one of the batteries isn’t charging when the engine runs. So as a result the engine is slowly draining it; causing the motor to shut down.
Any suggestions on where or what to do next? It’s not the alternator because the other batter is charging and we switched the batteries around to see if it may have been the battery (despite them both loading good) and it didn’t matter which battery was where it was the same #2 location that would not charge.
If I were you, I'd check copper feed (big red wire) and battery selector. I had a battery cable one time get a small slice and saltwater eventually set up corrosion. I could NOT see it. Put multimeter on every cable, including from selector and see if current easily passes. U may have a bad battery selector. Also, power may be leaching out at starter/feed connection.
 
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