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Cleaning the chassis grounds issue??

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Old Jan 30, 2010 | 01:28 AM
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Default Cleaning the chassis grounds issue??

So today I decide to check and clean all the chassis grounds, but I only made it through the 2 behind the headlights, the one by the battery, the one inside the left rear wheel well and the 2 in the interior in front of the doors before it started raining. All of them looked good with no corrosion but I used a wire brush to clean all the contacts on the wires and the mounts including tearing apart the splice packs, lubed them all up with some dielectric grease and reinstalled.

My problem is that now when I turn on the rear defogger I get an audible "pop" through the front speakers. Why is that??

I made sure everything was making good contact, didnt leave anything off either. You think this will go away if I do the other grounds tomorrow. It's not a huge deal just kind of annoying.
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Old Jan 30, 2010 | 10:24 AM
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If you smeared on a bunch dielectric grease to the terminal ends and ground stud, this may actually inhibit the connection.
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Old Jan 30, 2010 | 01:29 PM
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Well then, maybe I will go wipe a bit off the terminals.
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Old Jan 30, 2010 | 06:29 PM
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Funny. I always was under the impression that dielectric grease was conductive and promoted good contact between electrical connections. Was I wrong?
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Old Jan 30, 2010 | 07:02 PM
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Dielectric means electrical insulator.
It will prevent corrosion, but not a good conductor. Other dielectric materials are ceramic and glass.
I would spray electrical cleaner on the contacts and just put them back together.

Last edited by TEXHAWK0; Jan 30, 2010 at 07:06 PM.
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Old Jan 30, 2010 | 07:11 PM
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Originally Posted by Cybermind
Funny. I always was under the impression that dielectric grease was conductive and promoted good contact between electrical connections. Was I wrong?
Yes.

So think about what you are saying. If you put a grease that was conductive in a bulb socket, where both contacts are right next to each other, that would be a short circuit. The best contact between two surfaces conducting electricity is metal to metal.
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Old Jan 30, 2010 | 07:31 PM
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Originally Posted by lucky131969
Yes.

So think about what you are saying. If you put a grease that was conductive in a bulb socket, where both contacts are right next to each other, that would be a short circuit. The best contact between two surfaces conducting electricity is metal to metal.
You're right. But, what I meant to say is that I always thought that dielectric grease did not interfere with the electrical connection. Meaning that it would not actually insulate like regular grease. Thus recommended on electrical connections to keep corrosion and moisture away and at the same time, promote a good connection between two metals.

Now I am realizing that I've been wrong for all those years. Damn, I am glad that I always used it sparingly.

Last edited by Cybermind; Jan 30, 2010 at 07:39 PM.
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