How to Prevent Corrosion on a 4-Way Trailer Connector

Updated 05/27/2025 | Published 04/16/2016

Products Featured in This Question

Dielectric Grease for Electrical Connectors, 2 oz.

(1489)

$10.79

Curt 4-Way Flat Wiring Connector Cover

(274)

$3.32

Question:

I am looking for some type of a sealing cover of some type for my 4 pin flat connector on my trailers to protect them from the weather and corrosion. Any suggestions?

asked by: James D

Expert Reply:

For a cover designed to fit over standard 4-way connectors we have the # C58200. Another very helpful idea will be to put dielectic grease on the pins of your 4-way. This will actually be your best way to fight the corrosion. For that you would want the part # 11755. Basically you will need to apply a liberal amount of it all over the pins of the connectors before you put the cover on the 4-way and you will not have to worry about corrosion.

expert reply by: Jameson C

Nathan S.

5/27/2025

Thank you for this advice. I actually did this on my 4-pin trailer light connector the first time I bought from Etrailer and I maintained the amount throughout the year and it still corroded when I had the dust cover over the dielectric grease covered pins. I did not use it on the second trailer connection I bought a year later. A year later following the second purchase, it also corroded. Customer service suggested to buy a third. I think that etrailer 4-pin trailer light connections are subpar and I will buy from someone else and expose it to the elements so that it lasts me more than one year.

Jameson C.

5/27/2025

@NathanS Are the roads really salty in your area? I wonder if grease and no cover would be more ideal but if you're up north and salt is everywhere you may not be able prevent it