Hey guys, looking for some advice.. I have a 2004 75hp merc 4 stroke and the tach has not worked for a while now. I seem to be going through batteries far to often. So upon some research I have found that the the problem may be the rectifier or voltage regulator? It seems that when running the charging volts on my dash gauge read 14 volts. The battery guy I deal with thinks it's an over charging problem. Anyone else have any ideas? Or know of a good mechanic near london, I absolutely refuse to take it to hully gully. Thx for help guys.