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Thread: Need to run some wires through the firewall

  1. #1
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    Need to run some wires through the firewall

    Need to run some wires through the firewall. What's the best way to do it? I want the wires to end up at the fuse box under the glove compartment

  2. #2
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    If you pull some of the carpet back up near where it meets the glovebox, there's a rubber grommet which can be pierced to accommodate wiring. This is how the OBD2 wire for a JB4 is typically routed.

    It's a bugger to get to though, and you will ideally need to create a small slit in the grommet to pass the wiring through. A metal coathanger or similar stiff wire is useful to help draw/push the wire through the hole.

    The wiring will pop out behind the battery. It can be fiddly to reach - two people (one wiggling from inside the cabin and one waiting with a torch from the engine bay side) makes the job easier.

  3. #3
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    Even better... a walk-through with pics! This applies to the Passat too.

    Running Cables Through The Firewall – Volkswagen MK7 Golf – AutoInstruct

  4. #4
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    Excellent. Thank you very much petemac110.

  5. #5
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    Just to note on my rline Passat, which has the battery in the boot, I found it impossible to add sealant on the engine side of the firewall as it is very hard to get you hand in where the cable comes through.

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