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  1. I have a 1993 240 Signature 5.7L mercruiser alpha 2 outdrive voltage drops and engine dies at idle or under load. Sometimes is runs fine underway and it sputters and i watch voltage meter on dash drop and then it goes backup to over 12v and drops again and dies. I took the alternator off to test but the auto parts store couldn't test it. Does anyone think this is an electrical issue or fuel issue? Thanks,