· Senior Pirate
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I've had the same thing happen to me on my starboard diesel, where the ground and hot wire run about 12 feet to that engine. Find Your black wire engine ground. Remove it from the engine, and clean it with sandpaper or put on a new lug and then screw it back onto the engine. In my case I installed new wire lugs on both 12v and ground. The problem was solved and it didn't cost anything.