Wiring Through the Firewall. I've Been Doing It All Wrong. - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 03-02-2008 Thread Starter
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Wiring Through the Firewall. I've Been Doing It All Wrong.

OK, I'm probably the last guy on earth to figure out what turns out to be a very obvious solution, but just is case someone else hasn't.....

I've been running all my gauge and other wiring through the firewall through a small grommet located near the brake fluid tank and on the interior it comes out above and to the left of the clutch pedal. It works fine but it is small and it clogs the whole area near the brake fluid tank up with a bunch of wires and looks crappy. But near the fuse box on the passenger side is a giant grommet that exits behind the front passenger side wheel well. From there you can route into the engine compartment. The main harness goes through it but there is enough room in the grommet for all my gauge wiring.


2005 Mustang GT with 300 ci 04 Cobra iron block, Kenne Bell 2.6l twin screw, P&P S3 Heads, SS valves, Comp S3 cams, Currie 9+ 9" rear end and DS, Hurst shifter, BMR K-member, A-arms, LCAs & UCA, JBA long tubes & mid-pipe, Accel COPs, Dual GT500 fuel pumps, much more...
670 RWHP, 640Tq @ 16 psi & 6400 RPM
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post #2 of 9 (permalink) Old 03-02-2008
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Quote:
Originally Posted by 5twenty View Post
OK, I'm probably the last guy on earth to figure out what turns out to be a very obvious solution, but just is case someone else hasn't.....

I've been running all my gauge and other wiring through the firewall through a small grommet located near the brake fluid tank and on the interior it comes out above and to the left of the clutch pedal. It works fine but it is small and it clogs the whole area near the brake fluid tank up with a bunch of wires and looks crappy. But near the fuse box on the passenger side is a giant grommet that exits behind the front passenger side wheel well. From there you can route into the engine compartment. The main harness goes through it but there is enough room in the grommet for all my gauge wiring.
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1965 Mustang Coupe
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post #3 of 9 (permalink) Old 03-02-2008
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That thing isnt running yet!?
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post #4 of 9 (permalink) Old 03-02-2008
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that took me 2 seconds to find out when I did my stereo on day one of having my car. It was a little hard to get around the battery box cuz I don't like to remove things to make the job easy tho. It works good, cuz you put the power in threw the passanger side and put you remote and rca's on the drivers side and keep them apart. I like it

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post #5 of 9 (permalink) Old 03-02-2008
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Don't feel bad. There is an aluminum-esque sheet on the drivers side that can easily be poked through. I used to run my power wire through that hole. It ended up letting heat from the engine into the cabin of the car. Not cool. Later I found the grommet that you are speaking of on the passenger side. Easy access and if you ever need to drill a hole for interference purposes, it's easy to do.

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post #6 of 9 (permalink) Old 03-02-2008
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I found this last year when I did my S/C install

Saleen S/C 3.2 pulley. Chris Rose tune.

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post #7 of 9 (permalink) Old 03-02-2008
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There's also one just below and outboard of the master cylinder that's useful for running gauge wires and such.

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post #8 of 9 (permalink) Old 03-03-2008
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Is this the one where you have to remove the inner fender to run the wires.

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post #9 of 9 (permalink) Old 03-03-2008 Thread Starter
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Quote:
Originally Posted by 302svt View Post
Is this the one where you have to remove the inner fender to run the wires.
That's the one.

2005 Mustang GT with 300 ci 04 Cobra iron block, Kenne Bell 2.6l twin screw, P&P S3 Heads, SS valves, Comp S3 cams, Currie 9+ 9" rear end and DS, Hurst shifter, BMR K-member, A-arms, LCAs & UCA, JBA long tubes & mid-pipe, Accel COPs, Dual GT500 fuel pumps, much more...
670 RWHP, 640Tq @ 16 psi & 6400 RPM
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