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Firewall Grommet Solution: Please Read

catcarouser

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There is a rubber grommet under the passenger footwell carpet on a 2018 JL Wrangler Sport Unlimited.
I used it to run a positive wire from the battery, to a 15AMP fuse I mounted in the engine compartment by the PDC, then into the passenger cabin though this footwell grommet.
From there, I ran my wire along the footboard trim, to the right side rear passenger seat, under which I mounted a Sound Ordnance subwoofer. There's a ground right there by the right rear passenger seat.

I would say easy-peasy, but all the other "solutions" I've found on this site are... well, nuts. Maybe they work in your JL. They sure as heck did not on mine!

This passenger side footwell procedure is far better and easier than trying to push through the driver's side grommet, or lord help us, pulling the PDC in hopes of finding a hole through the firewall below the auxiliary battery.

How to:
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Simply drop your wire (inside flex conduit or taped up), to the right of the PDC (toward the center of the engine, not on the outside). It's a straight shot down to the ground.
Under the vehicle, which you can easily get below, find your wire and run it (inside your conduit) next to the electric wires already there! I used a couple zip ties to attach my new wire to the one already there, and also taped them together. Please note that your wire MAY drop behind the wheel well cover, but it's easy find and move without pulling pins or cutting anything.
Inside the cabin, pull back the carpet in the passenger side footwell. You'll find a rubber plug (about 2" x 3/4") a few inches in front of the passenger seat. Remove it, then pull your wire up through the hole. Drill a hole (`1/2" in my case, which was tight enough to "screw" the conduit into it, providing a tight seal) through the grommet, and pull your wire and conduit through.
Kids, that's it. Here are a couple pictures.



Jeep Wrangler JL Firewall Grommet Solution: Please Read hotwir

Here's my wire, inside its plastic conduit, and highlighted blue, that's been dropped through the engine, next to the PDC. At upper left, you can see the catalytic converter, which of course you want to avoid touching!

Jeep Wrangler JL Firewall Grommet Solution: Please Read install2

Here is the conduit (again, highlighted blue), coming up through the passenger floor grommet opening. The removed grommet is to the right of the wire. Just drill a hole through one of the dimples, and push your wire and conduit through it).

This took four days of false starts before I lucked into this grommet. Hope it saves y'all some time!
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Maverick909

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im not a fan of having the drain plug out just for the ease of installing a battery wire to a sub. it would be worth the extra 20 mins to run it through the firewall grommet up away from the water that the drain plug will see getting into the carpet etc. but again everyone has their own preference
 

Allagash27

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Could be a solution for some applications. Just make sure the wire is fuse-protected and well armored. The insulation could rub on the edge of the floor sheet metal and wear through, causing a short and fire if not.
 

Some Random Guy

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6 months like this and my loom had taken a lot of mud/dirt. It did it’s job, but was super brittle when I uninstalled it. This time I tried several methods through the firewall for power to my compressor, and ended up using a vacant grommet in the driver footwell. Not the clutch one (I have a manual, so it’s taken), but there was another one. 4 gauge made it through with effort.
Antenna coax is running up under my windshield and down through the tweeter into my glovebox area. Not recommended for power, but smaller coax and signal do well.
 

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jlewissystem

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If you have a manual, the double-walled grommet on the passenger side (I believe) is the only true firewall option. There’s actually a lot of room to run things, you just have to be good with your hands and not require an easy button :)
 

Some Random Guy

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If you have a manual, the double-walled grommet on the passenger side (I believe) is the only true firewall option. There’s actually a lot of room to run things, you just have to be good with your hands and not require an easy button :)
There’s another on the driver side. Harder to fish through though.
 

ASMSAS

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Can you point out where the ground stud is by the right rear passenger seat? When we wired my arb under the right front see and through to the front firewall we were surprised we couldn’t find a grounding stud cabin side of the firewall.
 

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jlewissystem

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Some Random Guy

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Can you point out where the ground stud is by the right rear passenger seat? When we wired my arb under the right front see and through to the front firewall we were surprised we couldn’t find a grounding stud cabin side of the firewall.
There should be a few under the kick panel, near the door connector. You’ll have to pull the trim to get access.
 

ASMSAS

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Ok thanks, pulling the trim is what we avoided since it appeared to be one loooong piece.
 
 







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