I have a '93 379. One morning while I was getting going I realized none of my interior lights were working. These being the reading lights(cab & sleeper), door lights, storage compartment lights, and the fluorescent light on the sleeper wall. They worked the previous night as I was going to bed, and every day before that.
All of my fuses are fine, no issue there. There has to be somewhere that all these lights are fed power from the same source, however, I can't find that place. I have looked at wiring diagrams and can't discern anything from them. I asked a shop foreman at a Pete dealer and he said he had no idea, and didn't recall anyone ever coming in with a similar problem. However, he was happy to try and figure it out for $100/hr.
Has anyone here had a similar issue? Could my problem be around the area where all my wires go though the firewall and in to the cab (though I can't see anything visibly wrong)? Thanks for any help or suggestions. I am usually pretty good with wiring and finding things, but, this has me stumped.
379 Interior Lights Not Working
Discussion in 'Peterbilt Forum' started by spax, Aug 17, 2011.
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spax,
The only reason I got on tonight was to make this exact same post. I installed a new stereo in my 1998 379 a couple days ago. I don't think I broke any wires in this apparent circuit while doing so. But every single light inside my truck is giving me problems. The guage lights still work properly. It's only the reading lamps, sleeper and cab, etc. that do not work. It's odd. I checked the diagram on my fuse panel door. I didn't see a fuse dedicated to interior lights. Even the bulb in my fuse panel is out. It's very odd.
If anyone can help us, it would be greatly appreciated.
spax, if I figure anything out I'll let you know if you'll do the same for me.
Good luck!! -
My fuse panel light quit at the the same time also. At least I am not alone now. I haven't run my truck much in the last month so I have not messed with it, but, I think you motivated me to dive back in to it today to see if I can find the problem.
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most of the mentioned lights etc are on circuit 19 , the fuse may be marked roof
it is below the turn fuse
here is a link to a post for schematics http://www.thetruckersreport.com/tr...ilt-forum/113177-link-to-pete-schematics.html
circuit 19 also goes to the stock radio harness.spax Thanks this. -
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Well, a little good news bad news. Longhood, per your suggestion to look at the one marked "roof", I indeed found a bad fuse. Wierd thing is it looked to be ok, but, for s's and g's I plugged a new one in it's place and I have working lights. For what ever reason I never focused on that particular fuse until today.
The bad news is that I had some of the lights on, walked to the pass side box to check that light and it didn't work, thought maybe bad bulb, no. When I walked back around I realized they were all out again, and the new fuse is blown. I guess now the search is on to find a short. At least having it narrowed down to 19 (thanks Longhood) will make it somewhat easier, I hope. -
It's odd that you mention that the stock radio is a part of that circuit. I installed a new radio just days ago and that's when my problems began. Think I might replace 19 with a fuse 5 amps larger and see what happens.
Thanks for all the input.
This board rocks!! -
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My fuses are not numbered. So, how do I find number 19? Any suggestions? You say it might be marked roof, and it should be under the turn signal fuse?
Thanks for the info.
Toby -
It was indeed the fuse marked roof. It was a 20 amp fuse, and it was burnt. Thanks alot. It sure has been a pain in the tail doing my log book in the dark. lol.
Have a great day!!
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