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I have had several boats come in my shop this season owners complained it died an wouldn't start again. Two were fuel injected late model mercruisers and one Indmar. They turned over but did not start. So thoughts of no fuel delivery came to mind but that wasn't it. Relays were checked and all found good. Hooked up the diacom there was a trouble code injector bank a&b fault. witch means bad ECU. or bad ground. These were newer boats mind you. So going to the simple solution first we chased down the ground wires to the block. Took them loose from the stud on the rear of the block they were all ready showing signs of corrosion. The leads were sanded and cleaned with contact cleaner. The real problem was paint on the block were the wires needed to make contact. The paint was cleaned off wires were reinstalled the boats fired right up. Owners reported they are all running great not missing a beat.
This can be true with anything that stops working on your boat. Go through your fuse panel. Clean your connection positive and ground you will find things will start working again most of the time.
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