I have 1994 Johnson 150 v6 that was overcharging batteries. it was showing 17-18v on voltmeter and then panel board shut down all the electrics on boat. I did some research and turns out it could have been rectifier/regulator so I have replaced this (not a cheap fix)!

I then took the boat down the river and it was all fine again, however, we took it out again yesterday and when I opened up the throttle it started overcharging again and all electrics shut down again.

After about 5 mins they came back on and all was well so we headed home and it all seemed fine but opened throttle again and same problem.

So it cruises along at about 20knts and everything is ok but any more and it starts to play up, so has anyone had any thing like this happen to them or know what it may be?

Also will anything else be damaged ie power pack etc because of to higher outage?