We have a mack CH 613 Tanker/nurse truck (I work for a fertilizer company) at work that the front parking lights don't work. The headlights work, the front parking lights don't. These lights double as the turn signals (use the same bulb), which are working. The headlights and the front parking lights, and the rear tail lights. use the same switch. The other lights, on the bed use another switch. I've tried replacing the switch with no luck. Is there a ground issue somewhere? I don't have a wiring diagram for this truck, is there a good place to get one? I know without seeing the truck it's difficult to tell me any ideas, but does anyone here have any ideas on where to go from here? Not very good with electrical on vehicles, so any help is appreciated. Thanks.
