They're powering 4k watts of amplifiers, a rear winch, and 2 rear mounted air compressors. That means your cable goes from the battery, across the firewall, firewall to cargo step, then back across to the other battery. Learn how to route and secure cables for a clean, professional look.
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This video will show one of the locations you can use for routing wires from the engine bay into the jeep wranglers cab area.
You run your normal fused positive wire directly to the accessory and you use multiple relays or switches (depending on your choice of switch) to control when the accessory is grounded.
I ran a hot lead along the frame and brought it up to the rear via access behind the right tail lamp If you do not want to use an aux, just drop a wire straight down from the battery.you can access the hollow frame rail right there and easily run the wire through that passenger side frame rail to the back of the jl. Find the complete wiring diagram for your jeep wrangler jk, including detailed schematics and diagrams for all electrical components. I am planning to run some wires from the engine bay to the cargo bay to power few led lights and i run into this installation video that shows how the wires should run.
Route it under the door seal, and to the rear There are lots of cables along that route going to the rear that you could strap your cable
