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After replacing the entire setup on my Montauk's trailer twice, I realized where my problem was. In my experience any wire that is exposed will corrode.

I used heat shrink butt connectors for the connections, dipped in liquid electrical tape. Where the ground wires attached, I coated the bolts with liquid tape as well. For the connector, I bought a spare female and filled the holes with dielectric grease. When stored, i plugged the connectors together. Long story short, nothing exposed.

If the wire jacket is deteriorating, have you considered covering it with wire loom?