The electrical connector has a lip around it that fits into a slot on the rubber grommet. The rubber is probably rock-solid with age. I worked the grommet & connector as an assembly out of the firewall and then had to carefully cut the gommet off the connector. New grommets were available for my 66. The quality isn't as good as the original so when I re-installed the connector & new grommet into the firewall I used some sealant around it.


Dave
66 GMC- father /son project with the "GMC KID"
36 Chevy PU- 4x4 lifetime project
64 Skylark- wife says its hers