The brake light on the driver side is not working when the headlight are off, when the headlight are on the are fine.

I would check the ground circuit on the drivers side read brake/tail light assembly. Make sure that the contact points and clean and not worn down. Also make sure the contact point on the light is good.

Check it out. It might have bad connection or burn out.
Good luck

mai

Replace the right rear brake light bulb. It is possible that the filament has burnt out and has fallen across to rest on the brake light filament. This would cause the condition you are experiencing.

yes ,
check the fuses.

These are all different circuits. The brake lights are on a 10amp fuse - the headlights are on a 50amp fuse - and the parking and dash lights are on a 20amp fuse.
Do you have power going into the headlight switch and the brake light switch ?

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.

yep i can,,,you have a very bad earth on one of the lights,,,check them all till you find the bad one some times a self tapping screw into the body work will fix it,,

Check your grounds. If it is a cargo van they should be attached on the sides of the rear door jambs.

there is a short in the system more than likely in the headlight switch itself causing the problem. not a hard fix just remove the covers from around the column and unbolt the headlight switch from the column and bolt in the new one and see if this fixes your problem also check and make sure you dont have a broken ground at the rear of the vehicle for the rear lights, should be bolted to the frame black wire, generally on driver side.

hi simple one the brake light bulb replace the bulbs brake light filiment has gone on one side droped on to the lights circiut hence press brake light headlights come on and vise versa yates210456