Question about 2005 Jeep Grand Cherokee

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Left brake light is out, but it is not the bulb, as it works for the other functions, just not as a brake.

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I'm not sure what you mean by other functions but it could still be the bulb. If you mean the tail lights work it's probably the bulb. If the blinkers work it's not the bulb but then that means you have a loose connection in your wiring harness somewhere that is feeding from the brake switch. Since both brake lights aren't affected I would say it is somewhere after the wiring splits under the vehicle more than likely in the bulb housing itself.

Posted on Jun 30, 2009

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Brake light bulbs have 2 elements in them. One bright one for the brakes, and a dimmer one for the night time lights. It's possible for the brake light element to burn out prior to the other element due to using the brakes more often than the night time lights.

Posted on Jun 30, 2009

  • Greg Margossian
    Greg Margossian Jul 02, 2009

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1 Answer

Left bleaker and break light not working. Turn signal works bleaks faster than right side.


Has the vehicle been in an accident on the left rear side. First check the bulb to be sure it is not defective, trade it out with the side that works properly to test. If the bulb works well then My thought are you may have a shorted wire. The turn signal flasher works by heat build up within the flasher the heat is caused by the load of the bulbs, the load heats the metal spring causing it to open the circuit then as quickly as it cools down the circuit closes again lighting the bulbs.
There is also a possibility of a defect in the turn signal mechanism on the steering column. The turn signal switch on many models does three different things on many models that use the same bulb element / or bulb for brake and turn on rear of vehicle. It controls the circuit for brake light by sending power both left and right side rear when turn signal is in neutral position then when turn signal is in left turn the switch cancels brake light power to left side rear and supplies flasher power to left side while maintaining brake light supply to the right side rear, and so on opposite when the right turn is chosen on turn signal switch. The turn signal indicators on the dash normally run off the same circuit as front turn signal bulb only which is also controlled by turn signal switch. Front has turn signals but no brake light.
I think there is an additional load on the left side rear turn circuit and it could be either a wire that is shorted or the turn signal switch if the same bulb element is used for both functions.
Often times if trailer lighting is connected the flasher will also blink a little faster because of the extra load of additional bulbs.

Feb 15, 2015 | Cars & Trucks

2 Answers

2007 ml320 cdi left brake light will not come on


It is apparent that the wire between the current sensor that the computer monitors and the left brake light socket is open. Thus the computer knows the brake light is not working because it is not drawing current. If you have a wiring diagram, you can probably find the broken wire or bad connection. This may take some time. To get the left brake light working, you can jumper the left brake light socket to the right brake light socket. Warning, this may cause the computer to register the extra current on the right side as a short circuit and shut both off. If that happens you will have to forgo the left brake light until you get the open circuit corrected.

Apr 22, 2014 | 2007 Mercedes-Benz ML320 CDI

2 Answers

I have a 98 f150 xlt. My left rear turn signal and brake light has stopped working but the running lights work on the same bulb. Ive replaced the bulb nothing, replaced the socket and nothing, even checked...


Have you checked the socket to see if 12 volts is reaching the socket for brake light citcuit? Probe the wires with a 12 volt test light probe (avail from any parts store for about $6)

Apr 13, 2012 | 1998 Ford F150 Regular Cab

1 Answer

2 of 3 brake light bulbs dont light up when brake pressed only when lights are on do all 3 bulbs light up, only on the right side, left bulbs turn on, I changed fuses and bulbs no luck


Chek the light harness ground connection, for each "faulty" bulb. l suspect the brake lights are detecting the gound from the running lights, which is the only time they all function.
Regards, DT

Mar 14, 2011 | 2004 Chrysler 300M

1 Answer

My left brake tail light doesnt work. It works only when my lights are off, but when my lights are on and I hit the brakes... it doesnt function. Ive taled to the dealership about this and they said I need...


They are right. The bulb has 2 filaments. One for the brake and one for the running light. One of the filaments has burned out. You only need to replace the bulb. The bulbs are inexpensive. It's just a maintainence thing. Not to worry all light bulbs burn out eventually. It's an easy fix.

Dec 29, 2010 | 2000 Jeep Grand Cherokee

2 Answers

Brake lights don't work


This sounds like a bad brake light switch, this switch is located on the bracket that holds brake pedal,you can test for power at switch,also if you remove connector and jump terminals with a wire and see if lights lite, if lights light then switch is bad,

May 27, 2010 | 2006 Hyundai Sonata

1 Answer

My top brake light is working but not the left and right ,brake light, fuse are ok and i replaced 1 socket and bulbs


Check the brake light switch,it will have dual function for the brake lights,and the third brake light.

Jan 19, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Left brake light stays on


Usually when your signal blinks rapidly it indicates a blown bulb.   Switch on your four-way flashers and check your bulbs at each corner.  On the brake light staying lit, check to see if the left-rear bulb is installed correctly and is the correct bulb for the application.  I've seen people force bulbs in sockets causing the braking element of the bulb to light instead of the parking element.  The braking element is much brighter than the parking element.

Mar 17, 2009 | 2000 Jeep Wrangler

1 Answer

Left rear brake light stopped working but bulb and fuses are OK.


These are Dual Function Bulbs. They control the Parking Lights and the Brake Lights. This Bulb is Burnt out on the Brake Coil inside the Bulb. I have actually seen Bulbs that were Bad But you could not Tell by jast looking at them. It should be fine with a New Bulb. Please Rate My Response! Thanks!

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