I am having a problem with the headlights on the plow I have. I get running lights on the plow but the directions and headlights will not come on. The headlights on the truck stay on. I do not have a switch that changes from the truck to plow light, I have a series of 4 relays that i believe takes care of the switching. I do not know how to test the relays but I did switch them around and they seam to be working. The third relay seam to control the truck lights, when i unplug this relay the truck lights go out, still not lights on the plow. when i plug one of the other three relays into this third spot, the headlights on the truck turn back on so I am assuming the relays are ok. Any help?