Rick
From your description, I can’t tell how you have your batteries connected. I use a separate starter battery that does nothing but start the engine. It doesn’t run anything else. This insures that no matter how much I run the house batteries down, I can start the engine. The boat didn’t come this way. It came with a pair of 8D deep-cycle batteries in the starboard locker. I found that these batteries weren’t very good for starting the engine. They don’t have enough cold-cranking capacity and they can get run down. What you really want is a starter battery for starting the engine and deep cycle batteries for house batteries. I use a generic truck starter battery. The largest starting battery that Sams Club sells. Hooking an isolated battery up like this can be expensive or complicated but there is at least one simple way to do this using a solenoid switch.
It sounds as if you have an electrical problem somewhere; perhaps a loose connection somewhere in your starter circuit. Try cleaning the terminals off with sandpaper and tightening them back up. The next time the engine fails to crank, try shorting out the starter solenoid. You may have an issue there.
Regards
Rich – BlackSheep
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