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Wiring through firewall?

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Hello, I'm trying to wire some additional lighting to the front and rear of my vRS, but I'm getting a bit stuck. I've got a control box for the lights in the cab, but need to wire it through to the front of the vehicle (car battery and mounted lights) but I can't find a way through the firewall.

Does anyone know of any existing holes and where abouts I could find them? The wires are very thin, so the hole wouldn't need to be big.

Thanks :)

Black trunking that runs from under battery to bulkhead, unclip it and there is a gromet that goes through bulkhead just behind bottom of glovebox

  • Author

You mean this part, that then leads just under the windscreen?

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Trying to find the grommet, but no luck :(

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There is a grommet to the right of the pollen filter under the scuttle panel, but make sure you seal it well, as all the water run-off from the passenger side of the windscreen goes over it. I filled mine with sealant, but after a couple of years it had shrunk and was letter water in, and I had a very soggy rear passenger footwell.

I ran a cable for my radar detector via the same route (though the plastic ducting from the engine bay up to the scuttle panel area)

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I did it how mbames said I believe. I removed the pollen filter, pollen filter holder and teh glovebox then pushed the cable through from the engine bay. It was really difficult and the cable (amp power) wanted to coil up behind stuff as it comes in quite high behind the dash board. Once its through though you are sorted as you can run the cable into the middle of the dash or down the side under the sill cover things really easily! :)

Lift the fuse box up to the side of the trunking and it goes through bulkhead lower down where it bends up.

I have 2 4 gauge power cables running through it so there is deffo a grommit there, sod going up round pollen filter

with a thin cable you might get lucky and push though a straightened out metal/wire coat hanger and the have the wire taped to it it. I think that is what I did (cause I was lazy - even if the glove box is only 5 screws and the cable for the light....)

  • Author

Thanks a lot guys - I'm going to get all the cables out and do some measuring up, then work out the best (tidiest) way to do it.

Thanks again :thumbup:

Edited by Tactical 87

  • Author

I really am having one of those days - I've moved the fuse box out the way and ripped out the glove box... but I can't find a grommet anywhere :(

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I've stuck my fingers right under where the fuse box usually sits, but still nothing.

You'll never find it from underneath

You need the right tool - you need to make yourself a cable puller

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This is mine (speaker cable being pulling up into doors)

Just a length of tough but flexi plastic cut from a sheet of plastic cardboard

Cordigrip your wire to the end, and pull it and weave it though holes and gaps nothing else can

Can be done without removing glovebox

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I love how nobody can find this grommit when its so large,

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Its between aircon pipes and inner wing, just pull the firewall sponge back and its there

  • Author

Oooohh... it IS that one then? Sorry Meg, it looked too obvious to be the right one :D

Thanks a lot :)

I love how nobody can find this grommit when its so large,

You've gone for a different grommet there

The one mbames and myself used is tucked way up behind the dash

I personally always used unused plugged holes to feed wires through rather risk damaging an existing grommetted pipe

Easier to make it watertight after woulds

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