I have a 1999 E Super Duty aka MH i dont have any back up lights, Have checked bulb, and wires to back of MH, ever thing looks good, Not sure where to go next. Does it get the signal from the trans. via the Trans range sensor

 

changed the mlp sensor still no reverse lights
is it control by a fuse or relay

 

On my 2015 350 super duty 6.2 l i found the reverse relay in the eng comp driver side body junction box BJM and tested the relay and fuses but i still have no power to pin 1 of the relay so i am still trying to figure out what is the problem . All this was brought on by adding rigid back up lights to the rear tapping into the reverse lights which draw 1 amp each to the circuit now I’m getting a code p0707 low imput to pcm .