P Bracket corrosion

[Al Taylor]

Has any P10 owner had this problem? I thought all the underwater metal was bonded so should be protected from this.

[Dave Cole]

If you get stray electrical currents in the water, all kinds of things like this can happen.   Id look into a diode based ground isolator. 
It prevents low voltage level currents from flowing through the ground conductor of you shore power cord.
Something like this.
https://www.victronenergy.com/isolation-transformers/galvanic-isolator#:~:text=The%20galvanic%20isolator%20prevents%20electrolytic,propeller%2C%20shaft%20and%20so%20on.

On Tue, Apr 15, 2025, 9:05 PM Al Taylor <awtayl...@gmail.com> wrote:

Has any P10 owner had this problem? I thought all the underwater metal was bonded so should be protected from this.

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[Peter McGowan]

and don’t bury that strut in fiberglass…. :) Couldn’t resist.

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[Peter McGowan]

Seriously though, if you’re not on shore power next observation would be your picture didn’t show any zincs on the shaft or prop?  

[Al Taylor]

I just pulled those off as part of the bottom job. They were >50% degraded but still in place. I also have a galvanic isolator installed for the last 4 years. 

On Apr 15, 2025, at 9:37 PM, Peter McGowan <mcgowa...@gmail.com> wrote:



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[Peter McGowan]

double checked engine also bonded, and keel bonded too?  

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[Dave Cole]

I dont know if your marina has ground fault breakers or not.  Mine does not.  If yours does not as well, you need to check your boats 120 volt electrical system and make sure that Neutral is not connected to ground on your boat at any point.  If it is, that will bypass your galvanic isolator, assuming you have a diode based one.  Unplug your shorepower cord, and use an ohmmeter to check between ground, on the boat side of your isolator and neutral.  You should have an open circuit, very high resistance, like megohms.  A grounded device, that is plugged into your boat could short the neutral to ground as well.  A mis-wired water heater could do it.

Electrolysis is a powerful thing.  Ive used it to strip rust off of antique iron fences.

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[Peter McGowan]

.. and you don’t have a flexible coupling (or of you do, it’s got a wire connecting both sides)