Buick Century wiring harness firewall passthrough location? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-30-2012, 06:22 PM   #1
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Default Buick Century wiring harness firewall passthrough location?

I was planning on hooking up my fog lights today, but I couldn't find anywhere in the firewall to squeeze the wires through.. Does anyone know where the stock wiring harness goes through the firewall?


Thanks in advance guys.
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Old 03-30-2012, 06:26 PM   #2
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Open up the hood and look for a large wire connection. Probably passenger side of the firewall.
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Old 03-30-2012, 06:34 PM   #3
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I looked along there, but I couldn't see it, unless its behind the coolant reservoir..
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Old 03-30-2012, 07:11 PM   #4
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Can you take a picture of your engine bay?
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Old 03-30-2012, 09:03 PM   #5
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Its dark now, so I'll get some tomorrow. I'll see if i can find some similar on Google when i get home later.
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Old 05-19-2012, 06:00 PM   #6
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It'* near impossible to find a place to run wires through the firewall of a Century without taking the entire dashboard off or drilling a new hole somewhere.

When I was running the wire for my subwoofer I tried to find a hole for it and couldn't. I took it to my local shop and he couldn't find a hole either, so we ended up running the wiring under the car. Annoying really. :/

You might try a wireless switch if you don't feel like drilling or taking things apart.

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Old 05-21-2012, 09:15 PM   #7
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Hmm. That looks pretty cool. I think I'm just gonna drill a new hole. I have some grommets, I'm just waiting for a nice day that I have off. I have them running directly to the battery on a relay using the park lights for the signal. It does what it needs to until I get the time to do it right.
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Old 05-22-2012, 09:07 AM   #8
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There are two locations that are relatively easy to use.

First one, pull back the passenger carpet and you'll see the main harness go out at the base of the firewall/floor. This pops out right behind the power steering rack and can be a little tough to locate from the outside of the car at first.

Second one is below the booster on the driverside. There is a plug and can be popped out. It'* a little tougher to get up there in the dash, but once you get one wire..you can pull through anything you want. I'd suggest replacing the plug with a grommet.

Best pic I have. You can see the passengerside area right above the boot on the rack and on the driverside..well..it'* not easy to see.
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Old 05-22-2012, 12:38 PM   #9
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That helps a lot Bill, thanks! I've been thinking about picking up a regal dash panel that has the dic and fig light switches, so I'll see if I can find the one on the driver'* side first.
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