Brake light, but no tail light

no jeep stated, no year stated.
wow.
tail = parks
jeeps can have lots of PARK lamps, only 2 on tail
the park relay is bad (stuck)
if car drives perfectly, but you never said that.
if all else works that tells my battery voltage is OK
and that the BCM didnt go batty, (on low volts failures)

pull there relay, see?

this jeep? has tails, rear, only.

I would suggest a total rewire back to factory specs. Not the entire harness, but every bit of the tail light. Replace everything that has been monkeyed with.

In order of most likely...

1. Switch on your e-brake stuck/bad/out of adjustment. Try pulling up on your e-brake or locate the switch and see if it's working.

2. Low on brake fluid, check the fluid reservoir in the engine compartment. Sensor switch could also be stuck/bad, unplug from reservoir and plug back in, tap lightly with screwdriver handle.

3. Burnt out tail/brake light somewhere on the car.

4. Not sure I've ever seen a fuse make the light stay on, maybe the ABS light but not the brake light, but you never know.

You did not say what year or model bike you have but if the brake light is stuck on, you probably have a bad front brake light switch. The switch is located in the right handlebar switch housing and protrudes out so that it is operated by the front brake lever. Make sure that the front brake master cylinder is adjusted down tight against the right handlebar switch housing.

Good Luck
steve

You have two brake light switches on your bike, a front brake light switch in the right handlebar switch housing and a rear brake light switch under the bike. To check for operation of either or both of the switches, remove the brake light lense and bulb. Turn the ignition switch on and have someone hold the front brake and depress the rear brake pedal at the same time while you check the contacts in the socket for power to each contact. One contact will be the brake light contact, the other is the tail light contact. If you have power to both, you bulb or the tail light ground is bad.

If you only have power to one contact, have the person helping you release both brakes. The contact for the tail light should remain hot as long as the ignition switch is on.

To find the rear brake light switch, find the metal brake line coming out of the rear brake master cylinder and going towards the rear of the bike. Follow this line until you come to a tee fitting with the rear brake light pressure switch screwed into it. Simply screw the switch out and replace it with a new one.

The front switch is more difficult as you have to disassemble the right handlebar switch housing, remove the throttle sleeve and open the housing up. Remove the screw holding the old switch and desolder the wires from the switch. Install the new switch and resolder the wires. Reassemble the throttle assembly and the switch housing taking care not to pinch any wires and making sure the throttle works smoothly.

Good Luck
steve

Ok for the brake light, the pressure switch for the rear brake may be bad. Find the rear brake master cylinder and follow the metal brake line that comes out of it going to the rear of the bike. You'll find a tee fitting in the line with the pressure switch screwed into it. Check to make sure the wires are plugged onto the spade connectors. If they are, the switch is probably bad and needs to be replaced. Simply screw the old one out and screw the new one in. Do not depresses the rear brake pedel while the switch is out of the line.

As for the tail light, if the bulb is good, you have a wiring problem and need to find where the wires is broken.

Good Luck
Steve

Could be bad brake light switch but turn signals involved so? Has to be bad ground.Light sockets corroded bad wiring thru fender mounting bolts in tail light assembly broke but corroded in place,not a good ground.Has to be simple cause bike runs.

Check the brake light switch attached to the top of the brake pedal. (It will be up under the dash and might be hard to see.) This switch activates the brake lights when the brake pedal moves or allows to move a button on the switch. If the switch gets out of position, the brake lights might not operate properly.

Another possibility is that the switch is bad.

I had the same problem, also. It turned out to be the brake relay switch was burned out. I have to replace my relay switch every 6 to 8 months. Hope this helped.

You have a bad switch at the brake pedal. Or a loose wire. Try light pulling on the wires on the switch at the brake pedal under the dash. They should be tight and secure. If tight and secure the switch could be bad.