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Well, you didn't mention what kind of vehicle you have so I can't tell you anything any more specific than what you told me. However, if your brake lights are the type that work on the same bulb as your turn signal, you could have a bad multifunction (turn signal) switch.
Sorry, I can't tell you much more than that with the information I have. YEAR, MAKE, MODEL, ENGINE SIZE would be very helpful if you would like a better answer.
You will need to scan the wires. Check closely around the bulb sockets. You might be able to see the damage visually, a burnt wire or a melted wire. You will need to test the wires with a volt reader. If it is not in that area, just start checking the wires of the harness. Also, make sure to look around the fuse housing also. Around the bulb sockets and fuse housing, check them first. If you have a question Marshall, just let me know. I will help you as much as I can. Thanks for choosing Fixya.
Can you just check to make sure the ignition key switch is not staying over to far and not backing off when you try to start it. I had a truck that did that and it messed up my turn signals until I brought the key switch back a little after starting it. Just a simple idea. Be kind with your rating for me. Raz
White is ground, black is power to trailer battery trickle charge, blue is brakes, green is tail/running lights, red is left turn signal and left brake light, brown is right turn signal and right brake light, yellow is aux power/back up lights. This is the general color coding, there are exceptions, white, black, and blue are pretty much always as listed above, sometimes the others vary. If you find you are having trouble, post any further questions here, I'll be glad to help out. Curt