2024 Ford F550 Upfitter Switch Wiring Diagram Download. — the upfitter switch wires are on the drivers side tucked below the fuse box in the engine compartment tucked right up against the firewall. — 2023 upfitter pass throug wire location.
— the upfitter switch wires are on the drivers side tucked below the fuse box in the engine compartment tucked right up against the firewall. — there is a diagram floating around showing what each upfitter wire does.