i have a 1989 120 hp johnson outboard,,,brand new marine battery last year, all connections are clean and tight, tach works, battery wont charge, voltmeter reads 11 volts at idle 12.5 volts at full throttle, then back down to 11 at idle, spent 8 hours on the water saturday and when i docked still read 11 volts,,,not sure if its the rectifier,,,do they go bad over time ? ihave never reversed the polarity which im told would kill it,,, would like to know for sure before i spend a 101.00 for a new one,,,,
