Well I have the beacon already and just use the cigerete lighter plug in but would rather hard wire it in the truck with a switch. I don't have upfitter switches so where would be an easy place to get power from?
If you want to be able to control it with the truck completely off, tap into the large gauge yellow wire coming from the steering column. If you want to go with accessory power so it will shut off when the truck does, it'll be the red/black wire in the same harness as the yellow one.
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