I have a 2000 BMW z3 that the brake light doesn't turn off while running. I've removed the wire off the switch but still on. The right hand signal flashes fast when lights are on.

SOURCE: 1998 wrangler turn signal/brake light short

your socket may not be grounded properly, I have seen this before, and the simplest way to fix is change the socket with a new one.Not another used one it may also be bad.

SOURCE: brake lights/rear turn signals

I had the same problem with my 1999 Yukon. The electric board needed to be replaced. Rust starts to build up and shorts out or blows the bulb. The dealership charged $73.60 for the part and I installed it myself (Saved $30).

SOURCE: front driver side turn signal light doesn't flash

replace flasher......usually located in fuse block area...listen in this area....select passenger side ...then select driver side...you can hear flasher clicking...you have seperate flashers for each...FLASHERS are small cubes plugged into fuse block....probable bad driverside flasher

SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards

I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!

SOURCE: i have a 2000 s-10

Try to get a schematic on your year and model truck, sometimes you can get one online or get a copy

at the library, or purchase from alldata info on just your truck, its very affordable and will give you a

wealth of info. it sounds like you have a poor ground, if you have a poor or dirty ground that is not

making good contact you will have a lot of resistance to the flow of voltage and current. in direct volts

and current voltage and current flows from negative to positive, negative=ground and positive=hot dc

if you have a poor ground you will have lights that may not work or may even go on and off as you hit

bumps on the road. you can use a test light to check for voltage, check at the fuse in coming from the

battery , the other side of the fuse, make sure you have the correct fuse for its purpose. check for volts

at the lights. you can also use a digital ohm meter. a test light is quicker, easier and cheaper for its

purpose, unless your looking for a precise voltage you want to use a meter. you can find a ground

most anywhere on your truck where you can clip your test light and probe for voltage. just make sure

the power to your lights is on. good luck!