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Author Topic:   zink or ground on outrage?
james cosby posted 06-19-2001 04:04 PM ET (US)   Profile for james cosby   Send Email to james cosby  
I noticed that on the transom of my 71' Outrage that there is a through hull fitting that appears to be a zink plate or a ground. On the cockpit side of the fitting is a wire connection. This does not have any wires connected to it, but I wanted to reconnect it. If anyone knows, I appreciate any info on what it is and how it was connected. Thanks JC
jimh posted 06-20-2001 08:39 AM ET (US)     Profile for jimh  Send Email to jimh     
The galvanic zinc electrode on the transom was usually connected by a green wire (~ 12-AWG) to other "ground" elements in the hull, such as the fuel tank.

I have to do some research on my boat, but I think the "green" wires (ground) and the "black" wires (battery negative) are connected at some point using a "galvanic isolator" device. I am a little fuzzy on this at the moment as I need to trace out some more wiring to verify.

Perhaps others can comment.


bigz posted 06-20-2001 09:55 AM ET (US)     Profile for bigz    
I think this should be connected directly to your gas tank, check and see if you don't have a small screw tab fitting on the tank probably close to the tank pick up fittings.
This provide galvanic protection for your aluminum tank. Use a green wire I believe is standard practice could be wrong there though.

JimH a galvanic isolator generally is used with shore power connection, it protects from stray DC current when your plugged into AC.

james cosby posted 06-20-2001 12:28 PM ET (US)     Profile for james cosby  Send Email to james cosby     
Jim thanks for the info. The original side saddle tanks were removed several years ago by a relative and I can't find the original parts or remember if there was ever wires connecting to the tanks. I plan to install new side tanks in the near future and trying to keep it original. I also need info on the original components to switch between tanks. Thanks JC.
lhg posted 06-20-2001 05:26 PM ET (US)     Profile for lhg    
The fitting being referred to, as Bigz says, is to ground the built-in fuel tank. That is it's only purpose. It is not a zinc, and has nothing to do with galvanic corrosion, but rather a static electricity "ground plate". It grounds the fuel filler fitting into the water, so you don't get a static electricity explosion from a gas nozzle.

Working forward in the boat, the green wire goes from the transom conductor to the withdrawl end of the gas tank fitting. Then a short wire transfers this ground from the withdrawl fitting to the tank itself. Then another green wire goes from the tank (adjacent to the fuel fill fitting) up to the fuel fill fitting in the gunwale.

White Bear posted 06-20-2001 08:55 PM ET (US)     Profile for White Bear  Send Email to White Bear     
Mine is an '88 20' Outrage. The green wire goes through the transom, follows the fuel lines and, through several connections provides a good for the fuel system from the fuel filler to the fuel tank.
james cosby posted 06-20-2001 10:29 PM ET (US)     Profile for james cosby  Send Email to james cosby     
Thanks for the responses. Although it's not hooked up at this time, I'll reconnect it when I install the new tanks. Thanks JC.
bigz posted 06-21-2001 07:30 AM ET (US)     Profile for bigz    
Larry, you maybe correct. Though my understanding differs and I maybe off base with my understanding.

On our 20 deep V Outrage it was used for, as I stated, a "zinc" to counteract the galvanic action to the aluminum tank (green wire). Also connected to the tank was a "ground" from the battery/engine (black wire) this also was connected in the case of this boat to the aluminum gunwale filler neck which is the "ground" you refer to prevent a potential "boom" from occurring when filling the tank. We have some what the same system on our 27 tank/s. Might add the fuel tank/s grounding is one area marine surveyors are very careful about checking and so is the Coast Guard for good reason!

I think, correct me if wrong, on the older Outrage the tanks were filled direct not through a gunwale filling fixture and hose to tank, so the ground from the engine only needed to be attached to each tank. The "green" wire is attached to each tank and the "anode" this protects the tanks from galvanic action. You have two different systems at work here, both doing protective work for different reasons. Tom

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