2011 ford f450

I'm trying to integrate my utility body power lock system with the factory installed locks in the cab. I need a (-) pulse to both lock and unlock the utility body doors. I'd like to utilize the progressive unlock feature (unlock passenger doors and utility body with 2nd press of the unlock button on the remote). Fooled around with it today but got no where. Any suggestions on where to start? Thanks in advance, Sean.

hi, find the door lock motor wires for the passenger door. they'll be reverse polarity, resting at ground. obtain two bosch-type relays, wire as follows: each terminal 86 to the door lock motor wire, terminals 85 and 30 of both relays to ground, terminals 87 are the outputs to the utility body door lock system. each relay will output a negative pulse depending on whether the factory system is locked or unlocked. mark