Firewall Grommet for Existing Wiring

JadeMonkeyStang

TRs on the Brain 24/7
When an alarm system was installed on my GN in the distant past, the tech simply pulled out the grommet that runs wiring from the engine bay to the driver's side interior of the car (on the firewall under the brake booster) and ran his wires through the hole where the grommet had been installed. This means that I now have an open hole between the engine bay and the interior. Does anyone have a recommended grommet brand or style that I can use to seal this hole and include both the factory and the aftermarket wiring? Pulling the wires out to feed them through the factory grommet isn't really an option at this point. I know I could cut the factory grommet, feed the aftermarket wires through, and then use some type of sealant (most likely silicone) to make it watertight but I'm hoping there's a more elegant solution.
 

HotAirWH1

Active Member
I would avoid cutting the factory grommet. Could you relocate the alarm system wires (cut & splice) and plug the open hole with the existing grommet / plastic flex tubing housing the cruise vac lines & wires (assuming this is the hole in question). The pic shows a small hole drilled about 3/4" below the large grommet. There is a nice flat spot there to go through the firewall. Use this new hole for the alarm wires. This pic is of the IAT routing wires going to the ECM during my 84/85 - 86/87 ECM conversion. Sealed up with a small grommet.
IAT Wire Route.jpg
 

JadeMonkeyStang

TRs on the Brain 24/7
I would avoid cutting the factory grommet. Could you relocate the alarm system wires (cut & splice) and plug the open hole with the existing grommet / plastic flex tubing housing the cruise vac lines & wires (assuming this is the hole in question). The pic shows a small hole drilled about 3/4" below the large grommet. There is a nice flat spot there to go through the firewall. Use this new hole for the alarm wires. This pic is of the IAT routing wires going to the ECM during my 84/85 - 86/87 ECM conversion. Sealed up with a small grommet.
View attachment 355912
Thanks for the thoughts and the pic. I still haven't addressed this but I was hoping to avoid having to cut / splice wires. At this point I think I'll either do the cut and splice through a new grommet (if I can't push them through the existing one) or just remove the alarm entirely.
 
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