Brake lights/turn signals don't work when headlights on
When it's night & the headlights come on, my brake lights come on but won't brighten when I brake and the turn signals won't blink. They work fine when the headlights are off. Obviously, this is a major hazard. What's the problem & any solutions?
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Well, the headlight switch would have no connection to the brake and turn signals. But you could have a ground problem somewhere. I would want to trace the circuit from the brake switch to the tail lamps with the headlights on to verify. And does it matter if you are using headlights or just parking lights.
The turn signals and brake lights use the same circuit and filament in the bulbs. The tail lights are on the other circuit which comes from the headlight switch. Do you have power on the tail light fuse ?
Sounds like you have 'ground' issues. Apply the brakes using a broom stick or more apropriate tool so that the brake lights are activated. Then go to the brake light that is not bright enough. using a test-light with a sharp pointed probe, poke the ground wire close to the bulb (usually a black wire) make sure the test light is attached to a grounded bolt. if the brake light gets brighter with ground added, you need a new ground wire. Splice it in to the existing wire & attach it to a bolt. Lights should work better with proper ground. (each bulb has a positive post & neg. post, don't add ground to the side with power coming through it from Battery (+)(red light on test light) - probe wires FIRST with test light to find (+) POS. Hot wire, and leave that one alone.
need to check the multi-function switch. the brake light signal goes through the turn signal switch on the steering column. the brake lights come on if the turn signal is not being operated. the circuit for the brake light can loose contact in the switch.
lamp failure light on possible because the SECOND filament in your STOP/TAIL Light Bulb is burned out- change one side and check fail lamp again- repeat on other side- fail lamp works off of resistance-burned or blown bulb is only way it lights unless you have a wiring issue