Best way to run a wire from battery in 21 T680

Need help on finding the best route to fish a wire to my battery up to the CB compartment

 

Drill a hole under your entry floor trim plate. Run it up behind the plastic up the pillar.

 

I would look around for factory cable holes n such before i would drill..

 

And keep a check on the wires once connected to the battery terminals road salt will eat wiring

 

On the 23 t680 there are unused ports plugged with rubber stoppers on the lower firewall. If 21 has those you can use one of those to run power into cab then fish it thru the side pillar.