Easiest way through the firewall?
Thread Starter
12 Second Club
Joined: Sep 2002
Posts: 597
Likes: 0
From: Tampa
Easiest way through the firewall? I need to run some wires from the engine compartment, into the cabin. Where is the easiest location to do this? I'd like to use an existing opening if I can cuz I'd rather not do any drilling.
I replaced my foglights with some Halo type Fog lights. I was able to use the existing stock wiring for the fogs, but the halo will require a seperate wire and switch. Any thoughts?
I replaced my foglights with some Halo type Fog lights. I was able to use the existing stock wiring for the fogs, but the halo will require a seperate wire and switch. Any thoughts?
Thread Starter
12 Second Club
Joined: Sep 2002
Posts: 597
Likes: 0
From: Tampa
The antenna wire goes thru the firewall???? I would have never guessed that. How does it get to the back of the car?
Back on topic........ Where would that be exactly? Would I remove the glovebox and see it plain as day, or what?
Back on topic........ Where would that be exactly? Would I remove the glovebox and see it plain as day, or what?
Doh...not antenna wire...I'm thinking of my truck. There's a wire that goes through the plug there from the engine compartment. Just pull back the passenger side carpet and you should see it slightly behind the heater box. It's about centered in the passenger footwell.
TECH Resident
iTrader: (3)
Joined: Dec 2002
Posts: 863
Likes: 0
From: Showing Italians the power of LS1
Here's the location of that grommet:
Once the PCM is removed, just get a coat hanger, straighten it out, bend a loop at one end, connect/tape the wire to the looped end, then stab the other end of the grommet. BE CAREFUL NOT TO STAB THE EXISTING FACTORY WIRES GOING THROUGH THE HOLE! If it makes you feel better, punch the hole into the grommet first with a phillips screwdriver, then poke the coat hanger into that hole. Next, open the glovebox, empty it, press the sides inward to drop the front of it all the way down. now you should see the coathanger coming out. grab the coathanger and pull. wire comes with it. (if you taped it well)
Once the PCM is removed, just get a coat hanger, straighten it out, bend a loop at one end, connect/tape the wire to the looped end, then stab the other end of the grommet. BE CAREFUL NOT TO STAB THE EXISTING FACTORY WIRES GOING THROUGH THE HOLE! If it makes you feel better, punch the hole into the grommet first with a phillips screwdriver, then poke the coat hanger into that hole. Next, open the glovebox, empty it, press the sides inward to drop the front of it all the way down. now you should see the coathanger coming out. grab the coathanger and pull. wire comes with it. (if you taped it well)
Trending Topics
Thread Starter
12 Second Club
Joined: Sep 2002
Posts: 597
Likes: 0
From: Tampa
OK so I did something completely different... 
In the driver's side footwell, there is a large plug/connector (I assume it's from the fuse block) that goes thru the firewall. A few inches to the left, a cable (probably hood release) goes thru the wall. If you locate these items from inside the engine bay, it is quite easy to get a long drill bit in there and drill a hole in the area right between the plug and the cable. You can reach your hand in there, from either side, and you don't have to remove any panels at all. Add a dab of silicone, and I'm done.
In the driver's side footwell, there is a large plug/connector (I assume it's from the fuse block) that goes thru the firewall. A few inches to the left, a cable (probably hood release) goes thru the wall. If you locate these items from inside the engine bay, it is quite easy to get a long drill bit in there and drill a hole in the area right between the plug and the cable. You can reach your hand in there, from either side, and you don't have to remove any panels at all. Add a dab of silicone, and I'm done.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
when useing the pass side grommet, make sure you seal it back up after poking your wire through with silicon or electrical putty (dumb-dumb). Otherwise, when it rains, water will travel down your power wire, right through the grommet and into your car.
Originally Posted by Mike @ FbodyAudio
when useing the pass side grommet, make sure you seal it back up after poking your wire through with silicon or electrical putty (dumb-dumb). Otherwise, when it rains, water will travel down your power wire, right through the grommet and into your car.
wtf are you talking about here? this is all under the hood and doesnt get rained on. If you've got water running that freely in the engine bay you've got bigger issues than the gromet.The easiest way to run a wire thourgh the gromet is to use a coat hanger. Or at, least it was for me. Go from the inside to the outside and you wont have to move the pcu. Its tucked up under the dash and you need to move the carpet and stuff to get to it.
I have an N2o line, 0/1 awg power line and a few more wires running through mine, plus the factory cables. I might be able to run on more wire through it if I had to but its pretty full. Water does not come in through the gromet at all. Not sure why you say you need to re-seal it but maybe you had trouble there. It isnt a spot that sees water and the car doesnt channel water anywhere near it. Its hidden under the pcu, which does not get wet by design.
most people that I've seen with systems (as were a few of mine), had the power wire running up over the strut tower. water can make it's way down there. All I know is I've had to 4th gens I've done systems in that way both have problems with water getting under the carpet over time as water traveled along the power wire and through the grommet.
