BF90 overcharging...

[phatdaddy]

I have zero knowledge of that outboard, but being a 4 stroke, does it have an alternator?

If so, is regulator separate or built in the alternator. We are very luck to have a very good shop here that still rebuilds alternators. Mercury has had an issue with the alternators on some of their motors. I am on my second and my buddy is on his third. Last time, he took his into the shop and they just installed a new regulator on his alternator.

Still ran about $125

If you have an alternator, maybe pull it off and take to a shop and see what they say

Sorry, can t help more