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2013 CTS-V Coupe 6MT Silver/Black
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Discussion Starter · #1 ·
So now I need a way to pass through 2 runs of 2/0 wire from the engine bay to the cabin. I've inspected the oem battery cable passthrough (or double passthrough, ugh) and I don't see myself being able to stuff the cables through that tight spot. Hell, I couldn't even get the 2nd passthrough into the cabin to budge. But ive seen posts mentioning the door jamb grommets and a possible larger grommet in the driver side floor near the brake pedal. That may be the money spot as long as my car having 3 pedals (6sp manual) doesn't mean there's no large grommet there in my car. Haven't looked yet. But thinking it's safer to get some input before I get back at it. Kinda hoping to hear from @random84 馃槉 and the other all knowing V pros. Please and thank you. Gotta get these cables run and connected before i can start her up and make sure the alternator install was a success 馃馃
 

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Without seeing the actual amount of wire you're trying to pass, the clutch pedal grommet is a good option. You might have to drill a starter hole, tape your wire to a bit of metal (metal clothes hanger, etc) and pull it through as the rubber is almost melted to the OEM wires to seal out smells.

The grommet at the door jam is easier, but won't clear larger diameter wire - I'd say shoot for the clutch pedal first, without knowing exactly what you're doing or where your sending wires?

Sent from my SM-G991U1 using Tapatalk
 

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2013 CTS-V Coupe 6MT Silver/Black
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Discussion Starter · #3 ·
Without seeing the actual amount of wire you're trying to pass, the clutch pedal grommet is a good option. You might have to drill a starter hole, tape your wire to a bit of metal (metal clothes hanger, etc) and pull it through as the rubber is almost melted to the OEM wires to seal out smells.

The grommet at the door jam is easier, but won't clear larger diameter wire - I'd say shoot for the clutch pedal first, without knowing exactly what you're doing or where your sending wires?

Sent from my SM-G991U1 using Tapatalk
2 cables. 1/2" diameter each. Going from the alternator to the battery in the trunk. But those would be the 2 spots to check though, huh? I'm gonna give it a go tomorrow.
 

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2011 Black Wagon
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There is a rubber grommet at the steering shaft, under the brake booster. I was able to heat up a metal wire, poke a hole then fish a couple of 18ga wires and a vacuum line though it. I don鈥檛 know about #2 wire though, how to route that. Might check it out anyway鈥
 

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2013 CTS-V Coupe 6MT Silver/Black
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Discussion Starter · #5 ·
Wanted to follow up on this for anyone looking in the future. That grommet above the brake pedal is PRIMO for passing through anything bulky. I it's big enough for a few runs of larger gauged wire. I just had to be cautious of clearing my clutch pedal when fully depressed. And what I liked about it was it was only one grommet. Unlike the double firewall on the passenger side. If I was only running a smaller wire for say a wideband sensor I would've probably opted for the door jamb passthrough. But for the heavy car audio stuff the drivers side foot well is the place to go IMO
 

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@MarkB81 if you don't mind me asking....what the heck will take so much juice running big wires?
 

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2013 CTS-V Coupe 6MT Silver/Black
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Discussion Starter · #8 ·
@MarkB81 if you don't mind me asking....what the heck will take so much juice running big wires?
So even though my HO Alt is only rated for a max of 270a. I replaced my battery with a few Lithium Titanate (LTO) batteries and Supercaps. My amplifier is "rated" @4k watts. But is capable of nearly double that. And although 1/0 cable would've done the job, going bigger ensures less resistance. BTW the 2 runs or 2/0 isn't 2 runs of positive cable. It's one positive and one direct negative off the alternator casing. Not sure if you're hip to the car audio scene. But too often people (myself included) will run 1/0 from front to back then need to go back and run a 2nd 1/0 when they continue to upgrade or whaver the case may be. So I basically wanted to go big with the 2/0 so I have PLENTY of wiggle room. The price of the 2/0 I use was only like $40 more than its 1/0 counterpart. So it made sense to me to just go bigger and not have to worry about going back and stuffing more in there later.
 

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V Coupe Pedal car
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Wanted to follow up on this for anyone looking in the future. That grommet above the brake pedal is PRIMO for passing through anything bulky. I it's big enough for a few runs of larger gauged wire. I just had to be cautious of clearing my clutch pedal when fully depressed. And what I liked about it was it was only one grommet. Unlike the double firewall on the passenger side. If I was only running a smaller wire for say a wideband sensor I would've probably opted for the door jamb passthrough. But for the heavy car audio stuff the drivers side foot well is the place to go IMO
Thanks for this info. I have the cradle dropped and I will be needing to run various wires for wideband and other bits. This is timely and helpful!
 
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