Thread Tools Display Modes
Old 10-03-2016, 02:00 PM   #11
Junior Member
Join Date: May 2016
Posts: 10
I have used dielectric grease for everything outside in the weather except battery posts. If you can't make an electrical connection when using dielectric the terminals are shy of the spring pressure needed to scrape the grease clean of the contact surfaces. Or the contact surfaces are corroded from weathering without grease. Don't use regular grease as it conducts and can cross-feed current between contacts and cause real havoc, especially with LED tailights. Regular grease is OK with battery posts because you want conduction between the post and clamp.

perrogie is offline   Reply With Quote
Old 10-03-2016, 07:25 PM   #12
Join Date: Oct 2015
Posts: 89
On the other hand.....
I had a problem with spiders nesting in the female end of the 7 pin connector. Dielectric grease solved the problem.

Denny B is offline   Reply With Quote
Old 10-03-2016, 07:33 PM   #13
Join Date: Apr 2016
Location: Escondido, CA
Posts: 37
Dielectric grease

f5moab had the best answer in my opinion.
Dielectric grease is an insulator and not a conductor. If there is not enough contact force to squeeze out all of the grease out and cut through the oxide layer to allow metal to metal contact, then it will cause contact problems. Oxide layer is just "rust" on copper/tin.
Bi-metal galvanic corrosion is usually not an issue as most connectors use copper/tin on both sides. Copper to aluminum contacts is not good and will always corrode over time.

The best way to clean electrical connectors is with a spray can of electrical contact cleaner that you can buy at any auto parts store.
Also make sure that your connector terminals have good spring force to create good metal to metal contact and a good "wipe" action when the connectors are pushed into each other.
Good contact force with good wiping action will solve most contact issues except for heavy corrosion/oxide build up. Then you need to clean with 150 grit or higher sand paper, but be gentle to be sure to not sand away the copper/tin plating on the contact.

Yes, if you have good contact force like Molex connectors have or if your 7 pin round connector has good contact force, then the "wipe" will cut through di-electric grease. But with all things equal... di-electric grease will never improve electrical contact. It will prevent oxide build up because it seals the contact from the oxygen in the air. WD40 is not good for electrical contact either, but it is thinner than grease and it does provide lubrication that can help improve the contact force so it can help sometimes, but be sure to clean it off later with the spray contact cleaner. Clean contacts and good contact force is the best way to provide good electrical connections.

larryandamy is offline   Reply With Quote
Old 10-03-2016, 07:49 PM   #14
Happy Camper
Join Date: Apr 2015
Location: Near Selma, Alabama
Posts: 72
If you don't use dielectric grease, be sure to use something else to protect the metal terminals from corrosion. It is so much easier to protect than to sand or file the terminals later. I have used dielectric grease in my auto repair business for many years with NO PROBLEMS. I keep a tube in my truck tool box and another in the camper.

Happy Camping!
Johntgif is offline   Reply With Quote
Old 10-04-2016, 04:55 PM   #15
Senior Member
Too Tall's Avatar
Join Date: Mar 2014
Posts: 782
Thanks for the feedback. In retrospect, as mentioned I believe I started using it after some oxidation had already occurred and the extra lubrication and non conductive nature of the grease prevented a good connection. Also as mentioned, my 7 pin connector does not feel very tight. I don't think it's wiping the grease off as it goes in.

It's interesting that sometimes something that seems so simple can present a problem when you least expect it. But all is good, I got it cleaned up and we are on location after an uneventful trip. Thanks for the help. I just keep on learning.

Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70
Too Tall is online now   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:02 AM.