Firewall to Engine Bay Passthrough?

[JamMasterJ]

Has anyone had success passing any wiring through the firewall? I am looking to route my GMRS antenna cable to the front from the cabin (glovebox specifically.) I looked and only saw mentions in another post. No pics or mention of where.

Thanks,

JB

 

[EOD Guy]

There is an existing hole in the firewall, driver's side. It is located just to the right and up (almost to the cowl) from where the existing wiring bundle passes through the firewall. It is plugged from the factory with a 1/2" rubber plug/cap. Harbor Freight grommet kit has the exact grommet that'll fit in the hole.

You can locate the hole from the cabin side by removing the DVR's side kick panel, pulling the carpet back (no need to pill back the felt padding) the hole is located above the felt padding. Run a fishing wire (AKA coat hanger) from the engine side and you'll be able to see/feel it from the cabin side.

 

[JamMasterJ]

Thanks brother.

 

[Sparky]

Thanks, found it, but is it large enough for an antenna coax cable to pass through?
I measured the hole at ~15mm which matches the marking on the grommet.
If the hole is too small, I may try replacing the connector and shortening the coax cable to eliminate any loops.

 

[EOD Guy]

Thanks, found it, but is it large enough for an antenna coax cable to pass through?
I measured the hole at ~15mm which matches the marking on the grommet.
If the hole is too small, I may try replacing the connector and shortening the coax cable to eliminate any loops.

View attachment 12062

That's it....

 

[dtxlcfe]

There is an existing hole in the firewall, driver's side. It is located just to the right and up (almost to the cowl) from where the existing wiring bundle passes through the firewall. It is plugged from the factory with a 1/2" rubber plug/cap. Harbor Freight grommet kit has the exact grommet that'll fit in the hole.

You can locate the hole from the cabin side by removing the DVR's side kick panel, pulling the carpet back (no need to pill back the felt padding) the hole is located above the felt padding. Run a fishing wire (AKA coat hanger) from the engine side and you'll be able to see/feel it from the cabin side.

Can you link the harbor freight grommet kit with the plug? All I see on there site is rings. Want a security blanket if I screw the oem one up

 

[EOD Guy]

Can you link the harbor freight grommet kit with the plug? All I see on there site is rings. Want a security blanket if I screw the oem one up

That's what I used the "ring" type. If I need a solid plug, I normally take one of the ring type, place a piece of tape on one side and fill the hole with black RTV......

https://www.harborfreight.com/180-piece-harness-grommet-set-67582.html

 

[dtxlcfe]

That's what I used the "ring" type. If I need a solid plug, I normally take one of the ring type, place a piece of tape on one side and fill the hole with black RTV......

https://www.harborfreight.com/180-piece-harness-grommet-set-67582.html

Ahh thought it was more of a copy of the oem plug, not a donut. Wanting to drill the oem plug for a more airtight fit

 

[EOD Guy]

Ahh thought it was more of a copy of the oem plug, not a donut. Wanting to drill the oem plug for a more airtight fit

Don't drill it! use an ice pick and poke a hole in the center, then use a #2 phillips screwdriver and poke it through the small hole....... increase the diameter of your poker until you get however many wires you want to poke through. I can get 6 16g wires poked through the #2 phillips hole. Very tight fit.