What is this pics included
 

Saw this on the back of my boat any idea?
http://i44.photobucket.com/albums/f9...3/f962c965.jpg
http://i44.photobucket.com/albums/f9...3/28c9353b.jpg

Is it plastic or a zinc? Wires on inside mounting bolts connected to motors?

Is it metal? Could be a sacrificial piece maybe?

Its an Anode and should be replaced when it gets a crust covering it. As said it should have a bonding wire on the inside of the boat running to a ground either on a stud at a bell housing or right to a battery.

looks like a secret transcepter beam locater,very hard to come by.:lolhit:

Hooked tO the Negitive post? Where can I get a replacment?

Here ya go.
http://www.boatzincs.com/MER43396.html

It's a zink used to stop electrolysis on metal parts.Is a must on boats that get left in the water.JOHN SR

Best to go to engine block on back where all your ground wires connect to the bell housing stud. All ground/bonding wires should really go to 1 single connection point.

You can check the site provided or any boating center should have them. There used on a lot of cruiser style boats and some center consoles.

My SS through hull fittings aren't grounded. Should they be? Boat is dry stored but may stay in salt for 5 days every so often. Ive never seen any problems.

Usually you only find bonding wires on thru hulls that have valves on them and that are under the water line when sitting in the water. Like water intake fittings for a/c, engine water, bait wells, etc. Most other thru hull fittings like a/c, bilge pump or any other discharge fittings usually do not have a bonding wire.

All metal that touches the water should be bonded to your grounding system. Any dissililar metal that touches water has an affect on your boats galvanic system. This could either be a grounding bus or or grounding junction where all your DC grounds should be common. I always thought it a ridiculous overkill to do this, until I saw the cost of replacement parts when you did not. Ouch!

Of course I am saying this as a previous owner of a 34-ft Sea Ray that stayed in the water 24/7/365. If your trailoring or only in the water for a day or two, it is not generally an issue.

Alot of boats will have the trim tabs bonded as well. My Fountains have been. The idea is to get all metals to same potential. Not only is it for dissimilar metals, but for electrolysis prevention too.

You know its really hard for OSO'ers to stay Grounded, Let alone their boats!!:lolhit:

Crazy Regards,
Ray @ Raylar