Mike-

Purchase the Upfitter Switch option (66S) if you have any say in the
order process.

This will give you 4 switches on the instrument panel, operational only
when the key is in the run position. These fused switches control four
relays; two 30 amp, and two 10 amp circuits. There are four blunt cut
wires located behind the fuse box under the steering wheel for you to
power whatever you would like.

Also, there are four handy "pass-through" wires going from under the
dash through the firewall if you need to get up front for lights, etc.

If you can't get the Upfitter Switch option, there is one other fused
unused ignition hot-in-run wire available: circuit 294 has a white/lt
blue blunt cut wire on the harness behind the DLC port. This is a 10 amp
circuit.

HTH