Master7122 Posted January 4, 2017 Share Posted January 4, 2017 My drivers side brake light doesn't light up until I turn on my drivers side turn signal??? So when I get in the truck only the passenger tail light will light up when the brake is pressed but if I use the driver side turn signal it'll work again? I don't even know where to start with that. Its a 1987 4.0 Auto 4x4 Link to comment Share on other sites More sharing options...
87MJTIM Posted January 4, 2017 Share Posted January 4, 2017 do you have a trailer wiring harness? often, these are improperly wired and can cause symptoms similar to yours. Link to comment Share on other sites More sharing options...
Tex06 Posted January 4, 2017 Share Posted January 4, 2017 My drivers side brake light doesn't light up until I turn on my drivers side turn signal??? So when I get in the truck only the passenger tail light will light up when the brake is pressed but if I use the driver side turn signal it'll work again? I don't even know where to start with that. Its a 1987 4.0 Auto 4x4Check your grounds. If you have access to a multimeter, pull your light bulbs and test the socket for continuity to ground and for +12V while someone is pressing the brake pedal, flasher on, brake and flasher on. Then post what you're getting here and someone can probably help you out :) Sent from my SM-G930T using Tapatalk Link to comment Share on other sites More sharing options...
Hippie66 Posted January 4, 2017 Share Posted January 4, 2017 +1 on checking grounds. Link to comment Share on other sites More sharing options...
gogmorgo Posted January 4, 2017 Share Posted January 4, 2017 Also make sure you've got the correct bulbs in the sockets. They should be dual-filament bulbs. There's a list of the proper bulbs in the DIY section. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted January 4, 2017 Share Posted January 4, 2017 My tail,turn, and brake light issues went away when I replaced my front sockets, seems corrosion caused all kinds of current bleed through... Link to comment Share on other sites More sharing options...
Master7122 Posted January 4, 2017 Author Share Posted January 4, 2017 do you have a trailer wiring harness? often, these are improperly wired and can cause symptoms similar to yours. Yes I have trailer wiring and it looks nasty. Very corroded looking and cracked. That's probably what it is. Should I remove it or take it to like a uhaul and have them install another trailer harness? Link to comment Share on other sites More sharing options...
Master7122 Posted January 4, 2017 Author Share Posted January 4, 2017 All grounds good, and everything works as it should once I do the turn signal thing. Also I am using the correct bulbs because when I put the incorrect bulbs in my brake lights were always light as if I was on the pedel Link to comment Share on other sites More sharing options...
87MJTIM Posted January 4, 2017 Share Posted January 4, 2017 You can undo the wiring harness. Test the lighting without the trailer harness. Make sure the grounds are good. Make sure you have the proper lights in the sockets. The brake lights are dual filament lights (1057?). If you use/need the wiring, there is a write up in the DIY section on the proper way to do it. Link to comment Share on other sites More sharing options...
Master7122 Posted January 4, 2017 Author Share Posted January 4, 2017 You can undo the wiring harness. Test the lighting without the trailer harness. Make sure the grounds are good. Make sure you have the proper lights in the sockets. The brake lights are dual filament lights (1057?). If you use/need the wiring, there is a write up in the DIY section on the proper way to do it. Thank you, I will get around to doing it this weekend and ill let you know what I find Link to comment Share on other sites More sharing options...
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