I went to the pull and pay place day before yesterday and scored the wiring from an extended cab that has never been cut into. But as I worked further towards the engine bay, the wiring which feeds through the transfer case mount/shock absorber, I found another problem area, over the years of movement, the coating was all worn off the wires, and a couple are completely bare. I cut out the crimp connector on the yellow/black, and touched the wires together, and the turn signal fired right up. I also got a multi tester, and started at the taillights and worked my way forward checking the yellow black wire, and near the front fuel tank, I found a jumble of wires where the PO had cut into the wiring and every wire under there had 2 crimp connectors on each wire. When you turn the headlights on, does the rear left taillight/sidemarker come on as well? So I fiddled with the dimmer switch, and then the lights came on, I will replace it. I did get things working, but it wasn't the headlight switch, I got a different one and put it in, and still no lights. It's a possibility for sure, and you've replaced so many other things, what's another one to add to the list? If not the grounds, not the sockets, not the TSS, could the issue be the headlight switch?Thanks for asking. It's the opposite of your problem: when my headlights are on, the rear left turn signal and brake lights don't work. Well.I discovered something about my own turn signal and brake light issues, which I thought was fixed. Thanks for all your help as usual guys.ĭid you get a new headlight switch? Things working? So a word of advice, always check your grounds, no matter how well you think you did cleaning them and checking them. Now my headlights aren't working, I believe it's the headlight switch, as I haven't been messing with any of the wiring for the headlights, so that leads me to believe it's the switch and not something I did to them, going to pick that up tomorrow, 15 bucks. I ordered a TSS that I was going to go pick up tomorrow, so now I don't need it, saving me 72 bucks. So I went out today and used a wire brush on those, and sure enough, I turned on the left signal, and boom it's working as is the brake light when pressed. Well, I'd used a wire brush and my drill on the bed of the truck where the wires for the tail light assembly, and the side marker wires attach, but I didn't clean the posts of those wires themselves. Many said check the grounds, check the grounds, and check the grounds. I re-read many of the things posted about the turn signal/brake light problems. If all of those things don't work, then try replacing the TSS Check with circuit tester along the way and also check some of the plugs in between each. Use the circuit tester.įinally, trace the wires at the back of the truck (mine ran just under the rear bumper between the back lights, as well as up the left side of the truck above the frame.and then again out the firewall in front of driver. The left rear turn signal is a yellow and black wire. At least clean the connectors, but a socket is about $8 at the auto parts store.Ĭheck to see if the wires at the connector under the dash (coming from the turn signal switch) are in place. Then use a circuit tester to check the power to the wires and the ground.easy thing to do, just learned. Visually compare it to the grounds on the other side. They just wouldn't flash.If I were you (and I was in the very same position a couple weeks ago- read this thread) I wouldn't jump to change the turn signal switch.įirst check the grounds at the tail light area. That one would not light up but the rear ones would. There could also be a break in the wire going to the front signal bulb. The additional clue is if you turn the signals off, then the left bulbs work with the brake pedal pressed, as they should, that proves the wiring to the rear is okay and the problem is likely the signal switch. Depending where a break is in the wiring, you could have the front one light up but not the rear, (that's the most common failure), or they all could not light up. If it's the signal switch none of the bulbs will light up. If the bulbs don't even light up, front or rear, on just the left side, that could be due to a defective signal switch or a break in the wiring. For now, what is the symptom? Do the left signals light up but not flash or do they not even light up? If they light up but don't flash, that is because there's not enough current flowing through the flasher to warm up the heating element, and that is caused by one or more bulbs burned out, so yes, check the front bulbs to see if they're lit up. The two sides can't be different so something is wrong there.
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