2014 Mercury 60HP bigfoot 4 stroke

by Dan
(Johnson City, TX)

Two things that might be related

First, with fully charged batteries. Voltage slowly drops when running engine. Ran 2-1/2 hours non-stop and voltage dropped from 12V to 11.5V. The only voltage drain was the depth finder.

Second, the Tach does not hold steady. RPM sometimes drops or rises up to 500 RPM with no real RPM change. Sometimes it recovers on it's own and sometimes I have to advance the throttle and then return it to the original position.

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