That would cause the brake lights to stop working. Posts: 2,300 Brake Lights not Working. I replaced pig tail, replaced pig tail plug from truck checked fuses. And finally, if the brake lights for some reason draw more power than the tow package wiring can handle then the lights will either not work or it will blow a fuse. Location: Fairview TX. The service crew contacted F-liner and requested a detailed schematic to locate the Diodes. --Just after my buddy and I got our licenses, he had a Simca, a French auto with ALL the switches on the steering wheel hub. Both sides of the turn signals work and the running lights work on both sides as well. Also, the trailer lights have the same problem (all lights work fine except the right brake light will not light). Accordingly, there should be no grounding If they are drawing too much power then switching to LED lights will solve that problem because they draw a fraction of the power compared to incandescent lights. Got my 98 W900 back from the shop and suddenly my brake lights are getting stuck on. soon there after the brake lights to the trailers stop working, the turn signals, four- way and tail lights all work. Turn, running, and flasher lights work fine, so it appears the light fixtures themselves are OK. the wife has a 07 freightliner coronado. #1316 wire from brake switch to chm has a weak ground all the time and strong ground when pedal is depressed. All the Toad lights worked the rigs running, turnsignal, clearance lights worked but "Brake Lights" did'nt. just not brake lights. Freightliner Owners Club. I too had the same problem with my 05 Freightliner chassis. The problem is that the right brake lights are not working, but the center brake light and the left side brake lights are working as well. Join Date: Oct 2002. The first time I had this problem. No fun finding out the lights don't work from a state trooper! I am working on a 2007 Freightliner M2 single axle road tractor.Id number 1FUBCXDJ47HX48489 the right side brake light on the tractor will not work… If the pin slides out farther, the brake pedal could detach, making it harder to stop the truck. she had the head light wiring harness replaced and also replaced fancy taillights. I'm hoping someone can give me a quick pointer on troubleshooting because I'm supposed to be heading for Texas tomorrow. So I ran all of the air out of my system and the brake lights … My AC was corrected and all lights working. When I left for the Freightliner service center this morning it was still dark and I realized that none of my rear or running or brake lights were working. Doing a cursory check of all lights I find I have no brake lights. 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