2024 F250 Upfitter Switch Wiring Colors. The ford upfitter switches are optional instrument panel mount switches (option code 66s) that control passenger side mounted relays. I found a bundle of wires in the passenger.
My 2016 f350 has the upfitter switches, i was able to pull the wires up enough from under the hood and behind the fuse box. We have been working with some customers who had a hard time figuring out what color wires were which switch on their 24’s.