Views on bondage!

[gunnarsilins]

Sorry, just wanted to catch some attention!

On my boat, all metal underwater parts, like skin fittings, prop- and rudder shaft etc are bonded together and connected to the engine block (and thus battery negative) and one huge zinc anode.

How should I do with a retro fitted bow thruster and keel cooler for the fridge? Both these items have their metal parts already connected to battery negative through the supply wiring.
Should I double up and have a separate wire connected from these to the anode?

Also, should an external aerial ground plate be connected to this anode as well?

 

[ccscott49]

Not sure about the rest, but the ariel ground plate should not be connected to the anode. I don't personally like all my skin fittings connected to the engine (battery) negative, as they could all de-zinc at the same time as the anode, given an electrical leak, I tend to go with the totally insulated method of engine/boat wiring, with only the (insulated) engine, shaft and prop connected to the anode, but there again all my underwater bits are bronze, even the shafts so no de-zincification is possible.