Here's how I did mine:
1. I started with running power and ground to the cab since I am using a fuse block w/ ground.
2. I also ran the antenna wire from the cab to the engine bay
3. Both can be ran through the rubber boot on the firewall. You do need to cut the boot slight larger to let everything through easily. It will be extremely helpful if you have a piece of thinner wire or something to fish through first, zip tie/ e-tape the wires you want to fish through the boot to the thinner wire. Apply some lubricant (WD-40 works just fine) and pull.
4. Now you have power and ground in the cab, and the antenna going to the engine bay, it's time to pull your head unit.
5. Drill a hole under the pen tray to feed the CAT cable for the radio display, and tuck everything under the floor console in the middle. Instead of going under the carpet like I do on customers' rigs, I just hide them under the all weather floor mat.
6. Using another CAT cable as an extension for the mic, do the same thing as step 5.
7. Reinstall the head unit, and you're good on the inside.
8. Install antenna to the mount of your choice. I don't recommend lip mount because I've seen lip mounts fail and damage the hood or whichever lip you're mounting it to. My recommendation is to use an extension and mount it on your ditch light bracket. If no ditch light... then lip mount or magnet mount.
9. Connect everything, and test. I also recommend plugging a 3.5mm speaker to your radio so you can hear better.
10. Sit back, relax, and pat yourself on the back for saving your money not paying half day's labor for this.
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You see 4 wires going through the gromet here. Power and ground for the fuse block w/ ground.
Smooth wire is the antenna wire
The one right above power and ground is my switch-pros controller wire.
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Custom made wood bracket, color matched because I ran out of black paint
I am running a fuse block w/ ground here because I am also hardwiring a fridge.
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There is a hole next to the charging port but you can't see it.
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Ditch light bracket from SDHQ
Ditch light extension from Rago Fabrication.
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And once you put the seat down you can't even see it's there.