Running wire from bed to inside cab. Best route?

[AltarBoy]

Is there a pass through on the backside of the cab or the floorboard in the back to run a wire through to the inside of the cab or do I have to run under the truck to the engine bay and go through the firewall?

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[Wighty]

There’s a grommet under the carpet towards the rear under the drivers seat. In my Pro there’s already a loom of wires going through it.

 

[CuriousTaco]

I used the one on the driver's side near the rear seat for the black wire in the photo. Sounds like there's probably a couple of these grommets on the floor that could be used.

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