I have a 2008 535 Quad Trac. Field lights and road flashing lights are giving problems. Normally with field lights on and turn 4 way flashers on, field lights would go off and only have front grill lights on for the road. Starting last fall, we turn the flashers on and field lights stay on also. Occasionally, flashers and rear field lights will alternate each other. Flashers on, field lights off. Flashers off field lights on. Looked like emergency vehicle coming at you. lol. I checked fuses. Light fuses and interlock fuses are good. Swapped interlock relay around and nothing changes. My dealer is also stumped. Is there another module somewhere for interlock system? Don't know where to look! Thanks!