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Old 03-29-2021, 03:59 PM #1
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Reversible Routes Through Firewall

There are many threads about running wires through the firewall. The three most common approaches are (1) puncturing a hole in the grommet that takes the main wire loom into the vehicle on the driver's side, (2) drilling a hole in the firewall, or (3) cutting a nipple or two in the grommet that takes some cables in on the passenger side.

The first and second approach then usually bring up trying to re-waterproof with something like silicon, which isn't durable longer-term.

The thing all three of those have in common is they are basically not reversible without significant effort, if at all. So for someone like me that's trying not to do much to the truck that can't easily be undone, not ideal.

There is one hole through the firewall that appears in a few posts and which TRD_John has publicized on YouTube, which is a bit above and to the left of the main wiring bundle on the driver's side (looking from front of vehicle):



I used it to run the cable for my Switch Pros + a battery meter and, save a few knuckles that got cut fishing wires under the dash, it worked well. The best part is if you punch a hole in the plug for the wires (which I did) you can buy a replacement for ~$1 from Toyota and reverse the whole thing in about 10 seconds.

I'd like to run one more wire into the cabin to power some lights in the cargo area. And I'd like them connected to my fuse block ideally since I want to be able to have them on when camping and sleeping in the vehicle, so constant power.

I noticed a second rubber plug on the passenger side, but haven't been able to get a wire through the hole into the passenger footwell area successfully, although I can see where the wires on the bigger grommet below come through in that space.



Has anyone ever successfully used this hole for anything?

I figure that someone must have given in a whirl at some point, so before I start taking apart the passenger side of the interior to see what's possible, I'd ask the community ...
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Old 04-05-2021, 12:23 PM #2
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No one, eh?

I did find this, so for people that find this thread in the future, here's a second trick if you are running small wire.

https://www.toyota-4runner.org/1168315-post2.html

https://www.toyota-4runner.org/787111-post22.html

I'm looking at a third possibility. If it works I'll dump that here too.
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Old 04-05-2021, 02:31 PM #3
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Quote:
Originally Posted by rageandlove View Post
I used it to run the cable for my Switch Pros + a battery meter and, save a few knuckles that got cut fishing wires under the dash, it worked well. The best part is if you punch a hole in the plug for the wires (which I did) you can buy a replacement for ~$1 from Toyota and reverse the whole thing in about 10 seconds.
I wish I could help with the passenger side grommet but I've had no luck.
The reason I am posting is to ask if you actually found a replacement grommet. The typical auto parts stores have "general/fit-all" grommets that don't seem to fit right. Do you have a link or part number for the factory rubber grommet?
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Old 04-05-2021, 02:36 PM #4
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Quote:
Originally Posted by PJSnow View Post
I wish I could help with the passenger side grommet but I've had no luck.
The reason I am posting is to ask if you actually found a replacement grommet. The typical auto parts stores have "general/fit-all" grommets that don't seem to fit right. Do you have a link or part number for the factory rubber grommet?
There's a part number printed on that grommet.
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Old 04-05-2021, 03:04 PM #5
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Quote:
Originally Posted by jp.vegas View Post
There's a part number printed on that grommet.
Yup, that's it. Bought a few from my local Toyota so I could experiment with various ways of punching holes. They are used under the truck too I noticed yesterday when I was checking my slider bolts.
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Old 04-05-2021, 03:26 PM #6
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There's a part number printed on that grommet.
Thank you!
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Old 08-15-2021, 11:16 AM #7
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Drill it out with appropriate size drill bit.
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Old 08-18-2021, 12:42 AM #8
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I realize this is an old thread.....

I've been drilling holes in the firewall on various cars since I was a teenager, never once had waterproofing issue.

Loads of places sell grommet plugs. Buy some plugs, pick a clear spot, drill the correct size hole, plug it and then poke the wires through. If we are being overly anal don't forget to touch up the bare metal from the drill with some paint.

To undo it just pull the wires and slap another plug in.
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Old 08-19-2021, 01:39 PM #9
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Take out and drill the rubber grommet from the picture above - not the firewall. Just make sure that opening is useful and lead somewhere accessible inside.
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Old 08-20-2021, 07:56 PM #10
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Quote:
Originally Posted by rageandlove View Post
No one, eh?

I did find this, so for people that find this thread in the future, here's a second trick if you are running small wire.

https://www.toyota-4runner.org/1168315-post2.html

https://www.toyota-4runner.org/787111-post22.html

I'm looking at a third possibility. If it works I'll dump that here too.
BTW, this path worked perfectly, for those that find this thread later.

That's several power wires and a Switch Pros connector through the firewall with no drilling and completely reversible.
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