How to get a wire thru the FIREWALL - Chevy SSR Forum
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post #1 of 9 (permalink) Old 04-22-2019, 03:10 PM Thread Starter
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How to get a wire thru the FIREWALL



Some of you are following my (speedo correction) post and now that I have that solved, I need to take my "temporary" OUT 4 hookup that is now hanging out my drivers window and make a permanent connection from the IP speedo wire under the hood into the cab.

I found a large rubber boot that has a big wiring bundle going thru the firewall just left of the master cylinder (looking from the front end). I managed to punch a small hole in it via an ice pick, and snaked a length of "weed eater" cord thru it.

Got under the dash and was able to grab the end, tried to crimp my small 20 ga. wire to end of W.E. cord via a wiring crimp plus a chunk of Duct tape.........but when I try to pull my wire thru, that damn heavy duty rubber boot won't let it thru.
Wire ends up pulling loose from W.E. cord.

I gotta believe some of you have needed to get a wire or two into the cab from under the hood. How did you get it done.????????????

YES, I am aware of the rubber plugs under the seats and have used them myself to run wires but I didn't desire to have to resort to ramping it up and jacking the back up again and running the wire that way.
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post #2 of 9 (permalink) Old 04-22-2019, 03:21 PM
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Try putting a little silicone on the wire and grommet and pull thru
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post #3 of 9 (permalink) Old 04-22-2019, 03:33 PM
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In past projects, in other vehicles I have used similar grommets and after punching the initial hole I followed up with long needle nose pliers. I opened the pliers and used the jaws to clamp down tight on the wire to be pulled through. I added a spray lube and pulled while rotating and It takes a helper to put the wire in the jaws, but I was successful. Good luck!


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post #4 of 9 (permalink) Old 04-22-2019, 03:36 PM
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The boot around the steering Column has more room. I used that to route my parking sensor wires.

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post #5 of 9 (permalink) Old 04-22-2019, 05:51 PM
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post #6 of 9 (permalink) Old 04-22-2019, 09:47 PM
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You could go "old school" and get out your drill motor and poke a hole where you need it. Just sayin'.
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post #7 of 9 (permalink) Old 04-22-2019, 11:01 PM
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Instead of silicone spray, try some baby powder. I think electricians use similar when pulling wire through conduit.
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post #8 of 9 (permalink) Old 04-23-2019, 12:43 AM
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Quote:
Originally Posted by moscooter View Post




I found a large rubber boot that has a big wiring bundle going thru the firewall just left of the master cylinder (looking from the front end). I managed to punch a small hole in it via an ice pick, and snaked a length of "weed eater" cord thru it.
I ran the wiring for the fuel pressure sender through the same boot. It's pretty heavy duty rubber, so I cut a slit and used a piece of heavy zip tie with the thicker ratchet part cut off. I taped the wires to it with electrical tape, and pulled them through first try.

The slit will close back up around the wires, so unlikely to see any moisture get through. I think you just need to expand the cut slightly for the wires to slip through.


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post #9 of 9 (permalink) Old 04-24-2019, 04:26 PM Thread Starter
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Quote:
Originally Posted by Flassh View Post
I ran the wiring for the fuel pressure sender through the same boot. It's pretty heavy duty rubber, so I cut a slit and used a piece of heavy zip tie with the thicker ratchet part cut off. I taped the wires to it with electrical tape, and pulled them through first try.

The slit will close back up around the wires, so unlikely to see any moisture get through. I think you just need to expand the cut slightly for the wires to slip through.

OK, I finally solved this deal. Scrambled thru my top tool drawer and found I had a couple of "cutters" I had made up in the past for other reasons. One was from a section of a golf club shaft and the other was from a piece of old fuel line. I had sharpened the end of each of them so as to be able to cut a hole in what ever.

One of them was about right size for matching up with one of the smaller (grooved wire sheathings) that are under the hood of most every car/truck. I had a short piece on hand.

So, stuck the fuel line section in my drill and zapped a round hole in that same "boot" mentioned before. This allowed more than ample room to run a wire thru and then I put the sheathing part over it. Need to get some more of that to complete the run to the C100 connector.

I have now completed my permanent Dakota Digital unit installation. Thanks again to all the support and assist.
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