loose or broken wire. bad connections att the fuse or relay. bad switch. bestt i ccan think of right now. hope it helps. duboff
Possible ground issue at the taillights.
Is it the taillights or the brake lights? If taillights it may be a wiring problem, If brake lights check the switch on the brake pedal
in dash lights
Fog lights are in the front; they are commonly referred to as "brights" because they are the brighter of the two standard headlights. Brake lights are in the rear; they light up when pressure is applied to the brakes or when the car is in park or reverse.
WHAT ARE YOU DUMB REPALCE YOUR LIGHT BULBS STUPID! Not stupid replaced circuit boards checked fuses ran test light . When headlights are on no brake light or taillights and have all new bulbs stupid. Turn headlights off brake lights work, so figure that out smart man
If you are referring to the brake lights it is probably a bad brake light switch. Your vehicle may also have daytime running lights which would be on without the parking lights.
If you have no brake lights or tail lights then you've probably got an electrical problem. Check the fuses first and see if you have one or more blown.
move the wiper connection around while somebody presses on the brake if brake lights come on replace circuit board to wipers my 94 chevy 4x4 did that found by accident 3yrs later was about to trash the truck
they are not brake lights they are fog lights and they turn on because it is for the car behind to see you
Check the fuse for the headlights. It is probably open.
Do parking and dash lights work? If not, may be fuse most vehicles it is the same circuit
you need to repair the lights and they will both work and your taillights will work properly
GO AND BUY I NEW light bulb !
Fuse for parking lights probably blown.
it may be your headlight switch, all mentioned circuits are routed through it
Often this type of behavior is caused by a bad ground for the lighting circuit. Check the ground circuit for the brake lights.
ummm... your brake lights should ALWAYS work whether your headlights are on or not, that's how people behind you know you are stopping.
Brake lights should NOT be effected by the headlights. Brake light function is completely independent of the headlights. Assuming you are not refering to the tail lights, or marker lights, which are supposed to come when the head lights are turned on. Not having brake lights when the head lights are on is a big safety problem and should be corrected.
It should say TAIL for taillights or maybe brake lights.
Check your fuses! -I once got a ticket for 'no taillights' when my dashlights were fine -it was the fuse.
the brake lights are on a separate cuircut,if your brake lights are staying then it will be a fault with the brake light switch. the switch is located under dash,and will be on or very close to brake pedal.
taillights or brake lights?it is common on many vehicles for the brake light switch (connected directly to the brake pedal) to stick over time. try gently pulling back on the brake pedal with your toe and see if the lights go off.if it is the actual taillights then i would look for a short in the wiring, possibly near the taillights themselves or right at the light switch in the cab.
Most likely a fuse.
It's possible that your alternator is not keeping up. Replace it and the battery. Usually when alternator fails the battery isn't too far behind. The led lights use more juice than the normal lights. Hope this helps.