kstater Posted January 22, 2010 Share Posted January 22, 2010 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. Quote Link to comment Share on other sites More sharing options...
Gambi80 Posted January 22, 2010 Share Posted January 22, 2010 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.Since it's at a fertilizer company most of the time...fertilizer is pretty corrosive...I'd check some wiring. On mine, the passenger side headlight (low-beam only) quit working and the driver side park light quit (turn signal worked). Ended up being in the wiring about 6-8" back from the headlight/turnsignal area...which had been replaced previously already...was bad. I cut out as much of the old as I could and just put in some new. Just get under there with a test light and have someone work the switches for you. Quote Ever wonder how a blind person knows when to stop wiping? Link to comment Share on other sites More sharing options...
Hammer Time Posted January 22, 2010 Share Posted January 22, 2010 Mack Schematics ------ http://smrp-prod.mac...default_ie2.htm ------- You need to download Adobe SVG Viewer to make their system work: http://www.adobe.com...viewer/install/ Quote Link to comment Share on other sites More sharing options...
Timothy B Demarco Posted May 3, 2010 Share Posted May 3, 2010 I'm having the same trouble on my CH. All of my headlights work, trailer lights work, and TURN SIGNALS WORK. I traced wire by wire for hours and found a wire corroded in the back of the relay box on drivers side engine firewall in cab marker lights relay. Quote Link to comment Share on other sites More sharing options...
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