Amp Research Power Steps and OBD

[Richard]

Originally Posted by bfr57

Thanks for the assist! So the steps I found are off a ‘18 Ford Expedition; no controller or harness. Pics are the wiring diagram and controller. It looks like I could just wire the harness into door switches where it’s labeled “posi-splice” and eliminate obd. Would have to make a parallel ckt for other door switch. Or maybe use a harness from a non-obd steps? Thoughts?

Not 100% certain but I believe that is the case. Tried to explain more in my previous post. No parallel circuit needed. Only one wire to each door pin. The L/R door pins are on one common circuit in these older trucks so both boards will deploy no matter which door is open. You could use diodes that are provided in original kit (think they sell separate) or isolate the door switches in another way to keep the steps independent to the doors.