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Old 02-06-2019, 06:11 PM #1
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Need to get some wires through the firewall

Is thee a gromet that is covering a hole to get through the firewall? I am looking at adding a HAM radio and a fridge down the road and I am just looking for ways to run the wires.
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Old 02-06-2019, 06:22 PM #2
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YouTube

Start at 1:20
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Old 02-06-2019, 08:07 PM #3
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Sit in the driver's seat.

Run an imaginary line through your left thigh (following your femur, basically) and out your knee and follow that imaginary line through the dash and to the firewall. Right about in that spot is a fat grommet with a main wiring loom running through it. The grommet has a ton of room all around to poke another hole and run wiring. There is enough room to actually get a PL-259 connector through there. All my personal installs on 4Rs and Tacos have used this particular grommet and all the ones I've done for others have also used this grommet.

A fast trick on getting wires through the firewall is to take a heavy duty, 18" long or so, zip tie and push it into the slit in that grommet that you made from the inside of the truck. If you are pulling wires in from the engine bay you can poke it 90% of the way through and tape the wires to the end, lube the joint with spit or windex, and then pull the zip tie back in to the cab. If you are going the other way (cab to engine) tape the wires to the end of the zip tie, lube, and then shove it through from the cab side and pull it out from the engine side.
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Old 02-07-2019, 12:55 AM #4
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I used a hard straw size plastic tube to get the wires through (think it was a crossbow arrow). Cut it to a smallish size but long enough to see both sides once thru and put the tube over a screwdriver. Jabbed the screwdriver through the firewall (carefully) and slide the screwdriver out while the tube stayed in place. Ran a few wires through and I was set. Removed the plastic tube and was good!

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Old 02-07-2019, 04:10 AM #5
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Quote:
Originally Posted by mteolus View Post
YouTube

Start at 1:20
x2. Good video find.

You can also send them straight through where the large factory harness goes through. Nip a small hole in the factory rubber grommet with a razor blade and send a straightened coat hanger through. Tape a lead wire to the end of the coat hanger and use that to feed your other wires through. I've done this on multiple 4Runner's, Tacoma's, and a Lexus GX. Using that smaller grommet is arguably cleaner.

I like to use dynamat or the like to seal off the hole after sending the wires through. Makes a nice weatherproof seal that's perfectly fine for under the hood/firewall applications.
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Old 02-07-2019, 10:23 AM #6
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Quote:
Originally Posted by JSparky View Post
x2. Good video find.

You can also send them straight through where the large factory harness goes through. Nip a small hole in the factory rubber grommet with a razor blade and send a straightened coat hanger through. Tape a lead wire to the end of the coat hanger and use that to feed your other wires through. I've done this on multiple 4Runner's, Tacoma's, and a Lexus GX. Using that smaller grommet is arguably cleaner.
This is what I did on both sides, just cut a slit in the grommet where the factory wires pass through

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Old 02-07-2019, 11:00 AM #7
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Thanks guys, I am trying to do it the cleanest way possible, since it is a 2019 with under around 500 miles on it. I have done the coat hanger through a hole with the xterra but I might do the dual battery setup so the fridge and hamradio and whatever lights that are on the bumper run off of that, I am waiting for the video to be added in the dual battery thread. I guess there aren't that many members in this area or else I would have some guys over.
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Old 02-07-2019, 11:06 AM #8
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Quote:
Originally Posted by Tango_6 View Post
Thanks guys, I am trying to do it the cleanest way possible, since it is a 2019 with under around 500 miles on it. I have done the coat hanger through a hole with the xterra but I might do the dual battery setup so the fridge and hamradio and whatever lights that are on the bumper run off of that, I am waiting for the video to be added in the dual battery thread. I guess there aren't that many members in this area or else I would have some guys over.
call me too Asian, but i used a chopstick haha
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Old 02-26-2019, 12:50 PM #9
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Well I finally have some time today and I will try to get the plug through the firewall, it's for a Kenwood HAM radio so I might need to use the big grommet.
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Old 02-26-2019, 05:32 PM #10
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call me too Asian, but i used a chopstick haha
I actually used bamboo skewers! Worked out surprisingly well with the sharp point and how flexible those things are.
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Old 02-26-2019, 05:48 PM #11
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I actually used bamboo skewers! Worked out surprisingly well with the sharp point and how flexible those things are.
Took about 20 minutes to get the wires connected to the battery, and the wires through the wall, also Kenwood doesn't send long enough wires, so they stopped right by the pedals so I have to extend them to under the seat tomorrow.
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Old 02-26-2019, 06:12 PM #12
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I used the small grommet location he uses in the video - after watching that video! I used the "V" end of a trim removal tool and it popped right out. Be sure to put some sort of grommet in there though to both protect the wires and seal out water.
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Old 02-26-2019, 06:40 PM #13
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Quote:
Originally Posted by Tango_6 View Post
Is thee a gromet that is covering a hole to get through the firewall? I am looking at adding a HAM radio and a fridge down the road and I am just looking for ways to run the wires.
Yes, it feeds in behind the under mat layer of the driver area. I fed both my amp power wire and the add a fuse lights for the raptor lights through it.
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Old 02-26-2019, 07:14 PM #14
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Thank you everyone, I just installed the radio and I have to say it was one of the cleanest wir runs I have ever done. I just have to figure out how to mount the radio under the seat and run the rj45 for the face panel. The mods have begun and I havent even hit 1500 miles on it yet.

Thank you again
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Old 07-07-2019, 10:01 PM #15
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YouTube

Start at 1:20
Plus 1 on the video find. Thanks for sharing.
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