Thank you guys for your help.

good morning,

cleaning stuff like that is on youtube ............ just saying...............

good luck,
PURA VIDA,
bluebonnet2

My lower unit was so bad it had to be repainted. The paint wouldn't stick; so they run an electrical charge through the lower unit the second time and no more problems. The paint held. The same thing will need to be done to the prop.. I don't believe cleaning will solve the problem. The rust will come right back. The electrical charge puts something back right to take that electrolysis out. You may even find that some of the wiring under the calum. and around the batteries have this white powder. It needs to be cleaned off also. If not it will harden the rubber coating on the wires and they become bridle over time.

don't heat the prop.
send it to josh at steves custom props and just have it sanded and buffed.


do you keep your boat around any chemicals (pool chemicals,etc?) that will cause it in a second.

Take prop to prop shop and have them buff it. I would definitely check out troll motor for problems..sounds like the source of it.

That is electrolysis. You can see one of the sacrificial anodes on the bottom of the engine bracket and it does not seem to be affected.

I would guess either your trolling motor or outboard is allowing a small amount of electricity to leak. The trolling motor is showing affects on the skeg, probably the only part that the paint/coating was knocked off.


Just curious but is there any wire going from the starting to trolling motor battery?

No, we went to Decker lake. Power plant lake. Then to Roberts. Lewisville is our home lake. Last two weeks noticed on trolling. Then went to squaw Friday. And the prop was stained/corroded after fishing there. We have some wires that aren't capped on telling motor that used to be connected to a ducer.

We started to try and diagnose the source. What we found is that the trolling motor was giving off about a half of a volt when running at 90%, it would fluctuate based on the speed of the trolling motor.

When testing the voltage to the motor we found that it was drawing almost 8 volts when we were testing it with the trolling motor battery (not cranking) so therefore there is some way the motor is drawing power off of those batteries.

Thoughts on where to go from there?

Make sure your motor and trolling motor are not sharing a ground. This usually happens when you use cranking battery to support your trolling motor. If you have a 12 /24 plug it could go bad at the plug and you could have issues.