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Mercury outboard over charging

I have a 1978 115 mercury outboard that is putting out to much voltage to the battery. the voltage is 15.9 volts at the battery. i changed the rectifier, but that did not cure the problem. anyone have a solution.

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Your motor is fine. It needs to put out more than 12 volts or the battery will not charge. Most alternators put out between 13 - 17 volts, so this is well within the range.

Posted on May 29, 2009

  • LORI A. WILSON Sep 22, 2017

    I believe anything over 14v is a problem in the automotive industry

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I think your motor should have a stater not starter,stater which regulates voltage output.i would have it checked out to see what voltage it is putting out...

Posted on May 17, 2009

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I have a 1983 115 mercury outboard it starts but wont stay running can anyone help me out

Posted on Jun 22, 2013

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i hope i was able to correct your problem.

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