Cleaning electrical contacts...

**Cane Pole** · 10-06-2009, 09:01 AM

Electrical

Cleaning Electrical Contacts

The copper parts of the connections, like circuit board edge connectors and the like, can usually be cleaned with a white eraser. If you want to get aggressive, try a fine Scotch-Brite pad, but be sure to leave some copper foil on the connector edge. For most jobs the eraser is the safest way.

The brass and silver and tinned connector pins are self-cleaning when they are removed and replaced. A thin layer of oxide forms on the surface, protecting the base metal from further damage. The pins and such are designed so that the oxide layer is scraped off when they are assembled/disassembled, exposing virgin metal for the best current flow.

All that said, I learned a good lesson from a marine electrician-- use silicone dielectric grease on the connectors to protect them from corrosive elements. In the boat this is usually salt water, but in the car this can be something like fumes from the battery, or from something that's in the air that day. No problems here in the crystal-clear L.A. basin, but some places may have real smog. Add a little moisture, shake well... Anyway, this stuff is sold in small quantities as "spark plug boot grease" at auto parts stores, or in larger tubes at industrial hardware stores as "high-voltage bushing flashover grease" or something similar. I buy Dow #5 in a small tube that lasts a long time. A little in the connector before assembly means you will never have a corrosion problem there again. Great stuff!

Also good to know-- NEVER use conventional RTV products on or around electrical connections. Use only non-contaminating non-corrosive stuff made specifically for electrical applications. Conventional RTV uses acetic acid as part of the curing agent, and plays hell with any nearby electrical connections.

And last but not least, most common spray contact cleaners are a waste of time. The ones that work for degreasing and really cleaning tend not to be sold at radio shack stores, and also like to eat some common plastics. Use your best judgement on this.

I got this article somewhere.

Connector pins are usually gold flashed. Don't get too aggressive when cleaning them. They can self clean by plug and unplug.

Best solution. Grease it.

**Yodibuzz** · 10-06-2009, 11:50 AM

thanks cane pole

one question, where can i find silicone dielectric grease?
thanks for all these little tips you pass on to us.

**chuckauten** · 10-06-2009, 01:16 PM

I have been using the dielectric grease for over two years. No more problems with corrosion. See you 10/23. If you have a chance, I would like to talk a little about my 997.

Chuck

**Cane Pole** · 10-06-2009, 01:20 PM

Originally Posted by Yodibuzz

thanks cane pole

one question, where can i find silicone dielectric grease?
thanks for all these little tips you pass on to us.

You can get it at car parts places such as Advance auto. Locktite makes some and 3m makes it. There are others I am sure.

good stuff.

**Cane Pole** · 10-06-2009, 01:21 PM

Originally Posted by chuckauten

I have been using the dielectric grease for over two years. No more problems with corrosion. See you 10/23. If you have a chance, I would like to talk a little about my 997.

Chuck

Ok. There will be others there to help too. Pete and JeffW know more than I do about this critter.

**chuckauten** · 10-06-2009, 02:05 PM

Looking forward to meeting all of you Tenn folks. I am arriving on Wed.

Chuck

**Wannabe...** · 10-06-2009, 02:06 PM

Go to any auto parts store and ask for spark plug boot grease. Same stuff. Advance and O'Reily's carries it in a single use package like ketchup from McDonalds for like 15 cents each. Good idea to drop a couple in your boat tool box in case you have an on the water repair to do. That way it get's done right the first time.

Wannabe...

**Cane Pole** · 10-06-2009, 02:11 PM

Originally Posted by Wannabe...

Go to any auto parts store and ask for spark plug boot grease. Same stuff. Advance and O'Reily's carries it in a single use package like ketchup from McDonalds for like 15 cents each. Good idea to drop a couple in your boat tool box in case you have an on the water repair to do. That way it get's done right the first time.

Wannabe...

Yep. Also you can get a pack of grease in a package (looks like a pill) at car place for lubing the car bulbs. Same stuff. I can't remember the name of it. Also distributor grease. Help me Wanna.......

**Pomoxis** · 10-06-2009, 03:55 PM

Originally Posted by Cane Pole

<cut>use silicone dielectric grease </cut>

I've been using vaseline for about 17 years or so for the same purpose. It's much cheaper and works. When I worked at Westinghouse we used vaseline between connections (especially puck diodes) to improve the connection and prevent corrosion.

Works well.

I'm ex-Navy avionics so I'm used to the extremes when it comes to cleaning contacts and preserving them. To date the BEST contact cleaner is an eraser like CP said. It removes the least amount of material.

I would love to find a civilian replacement for amlguard

..great stuff for any bare metal you can't immediately paint but need to protect..

**Cane Pole** · 10-06-2009, 04:56 PM

Careful with vaseline as it will attack some plastics and rubber. Check first.

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