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  #1  
Old 09-26-2022, 06:43 AM
warmblood58 warmblood58 is offline
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Black Goo in Bulkhead Connector?

Pulled the bulkhead connector on the firewall so I could get to the brake booster for paint and found all this tarry goo inside and all over the contacts??? Was this something that jeep used to discourage moisture in these plugs? I wonder if there was some kind of foam isolator that was degraded from solvent/heat/time etc - Anyone know? Stuff is a pain to clean up!
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Old 09-26-2022, 07:36 AM
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nograin nograin is offline
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Dark amber brown grease.
That was the typical color of chassis grease up into the '70s. My guess is that its just a good moisture resisting grease.
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Old 09-26-2022, 09:37 AM
warmblood58 warmblood58 is offline
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Quote:
Originally Posted by nograin
Dark amber brown grease.
That was the typical color of chassis grease up into the '70s. My guess is that its just a good moisture resisting grease.

Thanks - seems plausible, perhaps much of the solvents evaporated which explains the stickiness - onward. upward
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Old 09-26-2022, 11:57 AM
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Heep-J4000 Heep-J4000 is offline
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Yes what nograin said ,that black/brown stuff is/was for keeping moisture out the connectors.
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Old 09-29-2022, 11:40 AM
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Yes, dielectric (insulating) grease. It just happens to be brown. Intentional water-proofing.

You can clean it out and replace with new, colorless grease if it bothers you. When you are adding/changing wires you might want to supplement what's there. Sold in a tube - good for lots of things, like spark plug boots, light bulb bases, and other plastic connectors. Corrosion-preventative too. Any metal-to-metal contact pushes right through it, and has the same contact it would without it.

https://www.amazon.com/Permatex-2205...od_primary_new
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Old 09-29-2022, 12:05 PM
warmblood58 warmblood58 is offline
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Yep, I have several tubes of dielectric grease - I was just surprised at how sticky this stuff was - as previously mentioned, I am guessing that the solvents over time left the grease, hence the tar like properties
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Old 09-29-2022, 03:41 PM
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Maybe but I think the reason its so sticky is that its more a waterproofing grease.
A dielectric grease is more focused on suppresing very high voltage leaks - Voltages like the spark plug wires see 30 or 40,000 Volts.
The stuff in the connectors only has to be non-conductive. If it will resist breakthrough voltages of 28 V, that would be factor of safety of 2. It could have a heavy thickner and be NLGI 2.5 or 3 if that helped the weatherproofing.
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Last edited by nograin : 09-29-2022 at 03:57 PM.
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Old 09-30-2022, 09:26 AM
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Could be. You are right, the grease does not need super dielectric strength. Whatever it is, it was chosen to be compatible with the connector plastic, brass connectors and wire insulation. Suspect that randomly chosen grease might soften or embrittle plastic over time.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk

Last edited by tgreese : 09-30-2022 at 09:59 AM.
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  #9  
Old 10-01-2022, 06:53 PM
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These articles at Practical Sailor have some accelerated salt water environment tests conducted on different wires and connectors.

One minor difference is the jeeps use open barrel connectors with insulation support, but otherwise the tested products are similar and even include primary automotive wire.

One grease-like product they mention is No-Ox-It, which in a different article they mention decendent from cosmoline. Their description sounds similar to the stuff in the bulkhead connector.

https://www.practical-sailor.com/boa...worth-the-cost
https://www.practical-sailor.com/boa...re-test-update
I found the web versions a little difficult to follow, but at the bottom of each page there's a link to a pdf version.


Another corrosion test is for non-electrical but may be of interest for coating crevices and other locations that can't be painted or undercoated. I've used the LPS 3 as well Waxoyl for that purpose.
https://www.practical-sailor.com/boa...n-coating-test
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