How to clean firewall wiring harness?
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
How to clean firewall wiring harness?
I was told to clean the contacts between my firewall harness connectors behind the battery, as that may be the culprit in my flickery tach/lcd display.
I removed my battery and can get to the harness, but the only thing I can remove is a plastic cover over the top set of wires, and can't find any ways to actually disconnect the whole wiring harness to clean it.
Anyone has any Ideas?
BTW I have an '85 vette, but the harness/firewall should be pretty much the same as newer ones too IMO.
Thanks in advance
I removed my battery and can get to the harness, but the only thing I can remove is a plastic cover over the top set of wires, and can't find any ways to actually disconnect the whole wiring harness to clean it.
Anyone has any Ideas?
BTW I have an '85 vette, but the harness/firewall should be pretty much the same as newer ones too IMO.
Thanks in advance
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Ahh... thank you!! I finally got it.. What a PITA it was to get to that screw. Wouldn't have seen it if I wasn't told it was there.
Ok so I got the exposed contacts, I cleaned the contact parts and left the dark sutty weather protection goop inside. I used a small wirebrush to lift the goop off the exposed contacts and hopefully this'll make better contact and solve my issues.. we'll know tomorrow..
Thanks everyone...
Ok so I got the exposed contacts, I cleaned the contact parts and left the dark sutty weather protection goop inside. I used a small wirebrush to lift the goop off the exposed contacts and hopefully this'll make better contact and solve my issues.. we'll know tomorrow..
Thanks everyone...
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Usual problems here are water intrusion, a greenish or whiteish look. At any rate when you're thru-use some spray undercoating to seal the top and sides of the harness connection to seal it from future water intrusion (something GM screwed up on according to Killebrew) also make sure the cowl drip tube is not directly dumping onto the wire harness-another GM screw up. 
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Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
I recently cleaned the harness connector on my 89. I found that removing the battery and its holder allowed me better access to the connector. I cleaned the black gunk off the terminals using a tooth brush and xylene solvent. A rag placed under the connector caught all excess. I placed a coating of Ox-guard on all terminals before reassembly.
SAM
SAM
