1988 Mariner / Mercury 150 Overcharging

[pny212]

Well I figured I would fix it before my post to help out, I was hitting 17.2 volts at wot so I pulled the rectifier and it was good so my Merc dealer gave me a used regulator to try and it was the fix, now charges at 12.9-13.5,

he also told me to look for any lumps on the top within the black part as there was a small bump on the yellow side that he says it the visual of knowing something blew in there

on this motor it was a sealed box behind the flywheel on top with one red and one yellow wire

hope this helps anyone out there with this problem

Paul

 

[j_martin]

Re: 1988 Mariner / Mercury 150 Overcharging

Take your battery to the nearest place to have it load tested. It's near end of life if it can't hold down a 16 amp system.

What you did is the best fix, just finish the job.

hope it helps
John

 

[pny212]

Re: 1988 Mariner / Mercury 150 Overcharging

I actually replaced the battery first as the old one gased out and was absorbing most of the overcharging, thanks for the concern