Question about 2006 Chevrolet Silverado

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Both rear brake lights do not come on...the third brake light over the cab comes on when brake pedal is mashed. I have changed all the bulbs in the rear light housings and checked all fuses. What could the problem be

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I would check the stop light switch and the fuse in the under hood fuse panel

Posted on Sep 05, 2010

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1 Answer

Third eye works no rear signal or brake lights


The high mount brake light gets its own signal from the brake light switch (on the brake pedal). Or at least the wire leaving the brake light switch will splice, one wire to the high mount brake light, and the other for the rear brake lights is routed through the turn signal switch, and coordinated there with the turn signal wires to the rear brake lights. The brake wires and turn signal wires share the same wire, and same filament in the bulbs. It is kind of complicated, but brakes applied with no turn signal, brake light wire goes from brake light switch through the turn switch and out to the bulbs. If brakes applied with turning signal, non blinking brake light wire goes from turn switch to rear light, while the turning signal wire will go through the flasher relay, and then to the rear light to cause blinking.

I hope that makes sense. It appears the problem may be in the turn signal switch for both the turn signals and the rear brake lights.

Mar 14, 2015 | 2007 Dodge Ram 3500 Quad Cab Laramie

1 Answer

MY THIRD BRAKE LIGHT (LIGHT IN REAR WIND SHIELD) IS CONSTANTLY ON IS IT SUPPOSED TO REMAIN ON AT ALL TIMES, CHECKED BRAKE PEDAL SWITCH AND IT IS GOOD WHAT ELSE COULD IT BE


On some vehicles the lamps are controlled by a SAM( Signal Acquisition Module.)When these fail weird stuff happens.

The bulb needs power to come on and if the rear brake lamps are off, and not just burnt out, the third lamp cannot come on unless there is a faulty SAM or wiring short supplying the bulb with power..

Check your brake lamps come on with the brake pedal depressed first... if not, your brake pedal switch is bad or no power to it. I have often found both bulbs faulty on may cars.

Sep 13, 2011 | 1998 Mazda 626

2 Answers

My additional brake light is not working i have tested the brake unit and that works is there a seperate fuse for this or is it all on one fuse for all the brake lights


The third or High Mounted Brake Light runs straight off the brake light switch on the brake pedal arm. You say you tested the "brake unit"? I assume you mean the third brake light assembly, and if you get power there when someone steps on the brake pedal, then the bulbs are bad.

The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!

Aug 28, 2011 | 2002 Ford SVT Focus

1 Answer

Brake lights dont work or other lights are ok i change the break light switch i change all fuse but still some 10 dont work what can i do


Make sure you have the switch adjusted properly....If you remove the switch without unplugging it
the brake lights should come on....You have to have the brake light switch button placed in perfect position so when you mash pedal the switch button will release from switch causing the lights to come on.......Be sure the bulbs are not burnt out.....just for a test turn switch on and remove switch from pedal area without unplugging it to check for brake lights........If they are not on check bulbs..........

Mar 07, 2011 | 2001 Ford Focus

1 Answer

My break lights are not comming on--turn signal and parking lights are on --my break light on my cab comes on and have new bulbs. 2004 gmac


there usually are two brake switches on gmc's, one for the "third eye" or cab light and one for the rear brakes, look on the brace above the brake pedal for the second one, hint: the clip for the wires sometimes is loose or corroded, try taking it off and putting it back on (if the fuse is ok) first. other wise you will need to replace the switch.

Feb 21, 2011 | 2004 GMC Sierra 2500

1 Answer

When lights are on, rear lights(brake) go out when brake pedal is applied. Third brake light works normally all the time, and brake lights come on in day time though they are dim. Rear brake and running...


sounds to me you have a gounding problem with the lights in the back. ck the bulbs to see if they are in good shape no rust and such. than ck the wiring in the back and see if you find where they are getting the for the light at

Sep 03, 2010 | 1997 Chevrolet Camaro

3 Answers

My lights dont turn on when i push my brakes


FIRST CHECK AND SEE IF YOU HAVE POWER TO THE BRAKE LIGHT SWITCH ,IF IT DOES MASH THE BRAKE PEDAL AND SEE IF BOTH WIRES HAVE POWER WITH IT MASHED DOWN IF NOT THE BRAKE LIGHT SWITCH IS BAD ,BUT IF IT DOES HAVE POWER ON BOTH SIDES WITH IT MASHED ,BUT IF YOU DO NOT HAVE POWER TO THE BRAKE LIGHT SWITCH AT ALL CHECK THE BRAKE LIGHT FUSE IN THE FUSE BOX ,THEN CHECK YOUR TIL LIGHT BULBS NEXT ,IF IT IS NOT ONE OF THE OTHERS.

Dec 05, 2009 | 1991 Toyota Corolla

2 Answers

Third brake lights work but no rear brake lights


Check the switch on the brake pedal, connect the wires to each other and if the lights work then the switch is at fault, if they do not then check fuses, wiring etc.

Jun 16, 2009 | 1998 GMC Sierra

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