JeffD11N Posted September 12, 2015 Share Posted September 12, 2015 Guys,I need some help with an F model Dash fire. I posted under the Electrical, Electronics and Lighting forum the entire story. Since I'm new here I did not know if I should post it here.I'm hoping some of you Mack Guru's can help me out with my newly made mess.Please check my other post and let me know what you think.Thanks,Jeff Quote Link to comment Share on other sites More sharing options...
mowerman Posted September 12, 2015 Share Posted September 12, 2015 sorry cant help you much without seeing it...bob Quote Link to comment Share on other sites More sharing options...
JeffD11N Posted September 13, 2015 Author Share Posted September 13, 2015 Bob,The silly thing is real hard to see and I have the damn thing in the driveway! That harness is wedged up under that dash and I'm afraid the wire burnt inside the loom. Just looking to see if anyone could tell me what color the wires are and if they ran through a breaker or relay between the switch and shutdown.I'm afraind that I am going to have to start at the junction block behind the left headlight and cut the loom apart the whole way untill I find the crispy. Quote Link to comment Share on other sites More sharing options...
68-f-model Posted September 13, 2015 Share Posted September 13, 2015 I can look in my f model and tell you what color wire goes where if you need . Just let me know Quote Link to comment Share on other sites More sharing options...
mowerman Posted September 13, 2015 Share Posted September 13, 2015 Bob,The silly thing is real hard to see and I have the damn thing in the driveway! That harness is wedged up under that dash and I'm afraid the wire burnt inside the loom. Just looking to see if anyone could tell me what color the wires are and if they ran through a breaker or relay between the switch and shutdown.I'm afraind that I am going to have to start at the junction block behind the left headlight and cut the loom apart the whole way untill I find the crispy.you mite get lucky,,,and spot something right away,,,i would start by looking at everywhere wires connect to under dash,engine trans rearend abs ,exc,,and feel each connection with key in on position..should be able to spot it somewhere without breaking it open good luck...bob Quote Link to comment Share on other sites More sharing options...
JeffD11N Posted September 13, 2015 Author Share Posted September 13, 2015 Bob,the worst part of this this is everything is so jammed up in there that I started asking questions before going hog wild. I will have to do some removing af dash panels just so I can get a good look at all the spots you mention.68-fOn this one the wire that comes off the junction block and goes up through the door post appears to be light blue. No other colors but there is no light blue on the keyswitch. Is yours the same and what colors do you have on your keyswitch? Quote Link to comment Share on other sites More sharing options...
Bobby j Posted September 14, 2015 Share Posted September 14, 2015 If memory serves me correctly there is an ignition / accessory relay under metal cover of the doghouse......been years since I been inside on...welded my wedding ring on my finger against relay......quit wearing wedding ring that day......all that to say this take top of doghouse off relay/solenoid mounted close to heater box......Bobby j.. Quote Link to comment Share on other sites More sharing options...
68-f-model Posted September 14, 2015 Share Posted September 14, 2015 I have light blue, black and small yellow wires running up the door post.Not sure on the colors of wires on the key switch as mine are covered in woven insulation . Quote Link to comment Share on other sites More sharing options...
Phase 1 Posted September 14, 2015 Share Posted September 14, 2015 If you think it is only one wire, instead of tearing the harness apart, run a new wire between the two end points. The wiring diagram will show where it goes. Quote Link to comment Share on other sites More sharing options...
JeffD11N Posted September 15, 2015 Author Share Posted September 15, 2015 yep Light blue is what I have also heading up the door post. That is one start for me.My problem is that I do think it is only one wire but I do not know if it burned up other wires in the harness. None of those gremlins have shown up yet. The wiring diagram has now shown me where the other end of the wire actually is wich I had no idea. Just one big bowl of spaghetti under that dash.The Mack Museaum responded today with a diagram specific to this truck along with the factory spec sheet. Now that was cool!I should be on my way and will let you guys know how I make out. Quote Link to comment Share on other sites More sharing options...
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