No cabin filter on these, make sure the screen in the front cowling (bottom of the windshield) is clear, that is where the air source is. Also, make sure the mode doors are moving correctly - floor, panel, defrost, etc.
truck lights and plow lights are on at same time. I switched harness and same problem. I replaced...
(More)
truck lights and plow lights are on at same time. I switched harness and same problem. I replaced relays and now truck lights don't have high beams and lights on trailer has no break lights. I think the 2 relays are wrong and or wired up wrong?