Best way to run wire through firewall? - Team Camaro Tech
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post #1 of 20 (permalink) Old Mar 30th, 15, 04:07 PM Thread Starter
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Best way to run wire through firewall?

Im going to be running a 12v wire from my fusebox to my coil soon. I dont want to cut off the original wire, I just want to run a new one. Where is the best place to run it? Ive considered the large rubber grommet for my ac harness as a possible place and also where the vacuum line runs for my ac controls but Im wondering If Im missing something obvious. I dont want to drill any holes either. What have you guys done?
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post #2 of 20 (permalink) Old Mar 30th, 15, 04:10 PM
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Re: Best way to run wire through firewall?

The best is to simply replace the existing wire from the firewall connector to the coil

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post #3 of 20 (permalink) Old Mar 30th, 15, 04:28 PM Thread Starter
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Re: Best way to run wire through firewall?

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Originally Posted by Vega$69 View Post
The best is to simply replace the existing wire from the firewall connector to the coil
Maybe, but as stated I dont want to do that. I want to retain the stock wiring just in case I ever need or want to go back to points. Do all 67s have the backup light hole in the firewall? Or just factory 4 spd cars?

Last edited by carbuff67rs; Mar 30th, 15 at 04:38 PM.
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post #4 of 20 (permalink) Old Mar 30th, 15, 04:50 PM
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Re: Best way to run wire through firewall?

Just keep the wire then.

It's literally just a matter of pulling out the plug, replacing the connection and running wire.

It's the best way to do it.

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post #5 of 20 (permalink) Old Mar 30th, 15, 05:02 PM
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Re: Best way to run wire through firewall?

I ran a #4 amp wire through the lower firewall pad rubber plug hole. Running small wires through the pad plugs is an old school thing for the tach wire.

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post #6 of 20 (permalink) Old Mar 30th, 15, 05:42 PM
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Re: Best way to run wire through firewall?

I ran my pertronixs 12 volt 14 gauge red wire from my fuse box ign terminal up and out through the speedometer cable hole and tie wrap to existing harness up to and next to the coil. I know it's there but a neat installation. I took my yellow wire and resistance wire and tape around the connector and tuck it up out of the way in the harness tray.

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post #7 of 20 (permalink) Old Mar 30th, 15, 06:19 PM Thread Starter
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Re: Best way to run wire through firewall?

I forgot about the rubber plugs. That sounds do-able. The speedometer hole sounds promising too. I currently have no speedo cable so I will have to plan for the future when I get one.
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post #8 of 20 (permalink) Old Mar 30th, 15, 06:33 PM
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Re: Best way to run wire through firewall?

You can remove the resistor wire from the fuse box and coil connector and save it. Make a new 14g wire with factory connectors and replace it inside the harness, no one will tell the difference + you'll likely not go back to points but, if you do you'll have the wire still.

Where on LI are you?

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post #9 of 20 (permalink) Old Mar 30th, 15, 07:18 PM Thread Starter
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Re: Best way to run wire through firewall?

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Originally Posted by Luwi67 View Post
Where on LI are you?
Suffolk, North shore, around Port Jeff.
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post #10 of 20 (permalink) Old Mar 30th, 15, 07:27 PM
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Re: Best way to run wire through firewall?

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Originally Posted by carbuff67rs View Post
Suffolk, North shore, around Port Jeff.

HaHa, that's where I am, I can help you with the factory crimps and Packard terminals if you end up doing what I suggested. That's the route I went.

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post #11 of 20 (permalink) Old Mar 30th, 15, 08:43 PM Thread Starter
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Re: Best way to run wire through firewall?

Cool, small world, Ill keep it in mind. Still trying to figure out my best option.
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post #12 of 20 (permalink) Old Mar 30th, 15, 09:06 PM
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Re: Best way to run wire through firewall?

Like John said in post#2 just replace it. You don't have to remove the wire from the car if you don't want to, just unplug it from the back of the fuse box and the coil and tie it off. Run a new 14g the same route as the original resistance wire plug it in the same location in the fuse box.

Do you still have the original wrap on the engine bay harness?

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post #13 of 20 (permalink) Old Mar 30th, 15, 10:49 PM Thread Starter
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Re: Best way to run wire through firewall?

Quote:
Originally Posted by Luwi67 View Post
Like John said in post#2 just replace it. You don't have to remove the wire from the car if you don't want to, just unplug it from the back of the fuse box and the coil and tie it off. Run a new 14g the same route as the original resistance wire plug it in the same location in the fuse box.

Do you still have the original wrap on the engine bay harness?
Yeah, still the original. I dont quite understand how to replace the wire. Dont I have to unplug the harness from the connector block in the engine compartment to do that? Its old and fragile and Im worried about breaking it. Ive seen posts where people broke the lock tabs off the connector and had to rig it to stay plugged. Im trying to avoid that type of thing.
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post #14 of 20 (permalink) Old Mar 31st, 15, 08:30 AM
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Re: Best way to run wire through firewall?

OK, so you would just leave the wire in place after it's unplugged. I would run the new wire along the same path and secure it to the harness with tiny black zip ties. I got rid of all the factory harness wrap in the engine bay and used black loom (I hope I don't end up regretting that).

I did mine a while ago and I remember the firewall connector was not very difficult to deal with. If I remember correctly, I took the firewall connector off and stuck a tiny screwdriver in from the inside of the connector to bend down the retaining tab on the terminal. Remove the resistance wire and terminal from the connector (you would end up tying it back to the harness with black electrical tape, it's only 1-2") and plug in the new 14g wire with factory style terminal, snap the firewall connector back together and run your new wire along the backside of the engine harness and your done. If need be I have 3M strip calk to repack the back of the firewall connector if yours is deteriorated.

I think that is your best option, it's clean, durable, discreet and, reversable.

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post #15 of 20 (permalink) Old Mar 31st, 15, 09:35 AM
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Re: Best way to run wire through firewall?

The engine and light harness is bolted with one bolt in the middle. The are no clips to break. Just unscrew the bolt and pull it off.

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