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Can anyone tell me what the material they used to mate the male and female fuse box together? It seems to be a black tar like substance. I would guess it is for anticorrotion or to insure a good connection.
-John-
On later cars, Packard Electric put a dark-colored dielectric grease inside the firewall-side connectors to prevent moisture from entering the connector and causing corrosion once the connectors were mated to the firewall side of the fuse block. Similar dielectric grease (although light in color, like Vaseline) is available at electronic supply houses.
JK, from your question it seems that you could be referring to the sealing material used AFTER the bulkhead connector was assembled, so I will add this to John's already excellent answer.
On early shark cars which have the wiper door (68-72), observation reveals a hardening, black, tar-like substance that was used to seal the plenum area under the wiper door. This material was also used to seal firewall penetrations, including grommets and the harness connector/fuse panel.
In my AIM, this material is described as "Part Number 9980621, sealer, reclaimed rubber", and 10 onces (a lot!) are specified for the plenum area. The presence of the harness connector sealing is from my personal observation on my 70 and is not spelled out in the AIM; the extent of this application may vary slightly from car to car due to individual assembly workers or the result of water leak testing.
This sealing technique may also have been used in later cars, but I am unfamiliar with those year classes.