Need some help figuring this one out. Brake lights work on passenger side but don't on driver side. Directions work everywhere, lights work but the brake lights do not illuminate on the driver side. Please help.
I suggest starting with the basics, since there isn't a lot of info. First double check all the grounds for the tail light harness. Next check the bulbs themselves on the driver's side. Are they the proper dual element bulbs, and are they installed properly? Could it be each bulb has a burned out 2nd element? Is there a broken wire to the driver's side?
After that, we need a bit more info. Did this just happen, or have you changed something? Was the car sitting for a while...
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
Some more info. 1157 bulb. Could a bad socket cause the problem? It looks like my far left socket is broken on driver side. I also got my side markers to work but by doing so broke the passenger side marker socket. Anyone got got a tail light harness that they are not using that can cut off the side marker socket?
Bad bulb. One of the filaments is not working. Test that power is going to the light socket.
Also, the contacts inside the wiring socket get worn down. I have had to add some solder to the bottom of the bulb so that the bulb can make better contact in the socket.
When looking in the light socket you have 2 tabs, one a put a test light on each tab one lights up the other does not but is that because I don't have a second person to depress the brake petal? I'm thinking break in the line but if the passenger side works driver side does not its all one harness.
Both sockets on one side are wired in series. So, yes if one socket is bad, both will not work.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
I realized late that you have turn signals but not brake lights on one side. Now you are looking at something really strange as those two items use the same electrical path at the back of the car.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
If I'm reading this correctly the brown wires are lights, the yellow wires are turn, brake, flashers? So if the inboard socket/bulb is bad the outboard would not work either, like Christmas tree lights in series..
New finding. The 4 way flashers do not work on the driver rear same spot that the brake lights don't work. Thus this further complicate the issue or help diagnose the problem.
Another new finding. I monkeyed around with the flasher button realized that when you push it in it doesn't stay in like it is supposed to. By pushing it in and having it pop out over and over again the driver side rear flashers started working as well as the brake lights. So the issue is in the column somewhere. More to investigate.