I have a western uni-mount plow on a 2001 dodge ram 1500. The harness is a 9 pin plug with 2 relays. The truck head lights are HB-1. I just bought a new harness for the plow, which fixed my parking lights, but the headlights still won't switch over when I connect the plug. If I have low beams on in the truck and I connect the plugs to the plow, the headlights will work, but only when I hold the hi/low beam switch back on the steering column. Lights turn back off when I release the hi/low beam switch. Any thoughts?