In article ,
says...

I bought a new SeaPro with a 200 Yamaha FI in March and keep it on a
trailer in an enclosed storage building. On weekends I launch and
leave it in the water until Sunday. The trim tab is a sacrificial
anode and is deteriorating rapidly - lots of pock marks. I've done
some searches and found sites on what electrolysis is but haven't


If you have a stainless prop you may find a high rate of anode
deterioration. The stainless prop/ aluminum case/ zinc anode
are your source of current flow in brackish or salt water.

Raise the motor.

If you have a stainless prop you may find a high rate of anode
deterioration. The stainless prop/ aluminum case/ zinc anode
are your source of current flow in brackish or salt water.

Raise the motor.
That is the case and could well be the problem. Also, the motor is
mounted to an Aluminum jack plate which is bolted to the transom. I
wonder if this could increase the problem? Anyway, it looks like I
need to raise the motor when at dock which is not really a problem -
just a habit I need to develop.