Originally Posted by neilda
Could also be a starter motor issue -it may be momentarily 'frozen'.
If that was the case, the trim would work.
As you said,it'll be a poor connection or joint. I'd be looking at all the heavy duty cable connections (including the crimpings, and specifically any soldered joints if someone has soldered any of the joins) between the engine and battery,plus the battery isolator.
Given that all the other stuff on the boat works,I'd look at connections over the isolator.
If the nav lights are working at full brightness, there'll be more than enough power getting through the isolator switch to make a trim or starter solenoid click, even if there's not enough power to run the starter/trim motors.
This is unless of course the isolator is solely for the engine.
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