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Brake light bulbs are illuminated within the rear combination light assemblies whenever the brake pedal is pressed. This happens because of the brake light switch (also known as the stop lamp switch) located above the brake pedal. Pressing the the brake pedal closes the internal contacts of the brake light switch which transfers power from the battery to the combination light assembly. For example, in a '94 Geo Tracker the STOP/HORN fuse (15A) supplies power to the brake switch via a green wire and then to the combination light assemblies via a green/white white wire whenever the brake switch contacts close. These are the only two wires for the brake switch. The combination light assemblies on the other hand have four wires; brake light input (green/white wire), tail light input (red/blue wire), turn signal input (green wire) and ground (black wire). If all of the brake lights are inoperative, chances are the brake switch has failed or the power-supply fuse has blown. This is because it is highly unlikely for all brake light bulbs to fail simultaneously (although not impossible). You can read more here: https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-brake-light-switch
disconnect turn signal switch wires @ column, put power to wires to brake lights. that cks wiring to lights. next put power to wires through turn signal to ck switch. Power runs from brake light switch to turnsignal switch, to lights.
The brake light wire leaves the brake switch and goes into the turn signal switch. They often share the same wire: the rear turn signals and the brake lights. When turning, that side is routed through the turn flasher, but you get a steady brake light on the other side.
So you have power to the brake switch. Pull apart the connector for the turn signal switch, and see if you have power in on the brake wire (with brake depressed of course) going into the turn switch. If you have power in, plug the connector together, and see if you can backprobe the connector with test light or voltmeter, looking for power out to the rear brake lights. If power in, but no power out, the turn switch is probably bad.
Since the turns work in the back, that means the brake bulbs are good. Brake lights and turn signal lights share the same filament in the bulb.
There is a fuse for the brake lights. Then, there is a brake light switch on the brake pedal. You need a voltmeter or test light, after checking that fuse is good. Need to check if fuse has power on it. This is one of those fuses that are hot at all times-as long as battery is connected, voltage should be going through the fuse and up to the brake light switch. Check for power both places. The switch on the pedal is a simple on-off switch. When brake is depressed, the spring loaded switch is turned on-passing power on towards the brake lights.
But then the brake wire goes into the turn signal switch before going on to the brake bulbs...however, since your turns work good, I doubt if there is a problem in the turn switch. First check if the brake light switch is sending power on when switch is on.
Let me know what you find. Good luck.
It could be the turn signal switch, since the brake wire travels through the turn switch after it leaves the brake switch and then goes to the bulbs. That is how you get a steady brake light on one side, and a blinking light on the turning side. The rear turn signal lights and brake lights share the same filament in the bulbs (and the same wire). The wire on the turning side has to first travel through the flasher relay. If you have a test light, first check for power out of the brake light switch with the pedal depressed. Then check for power in and power out at the turn switch connector-power in on the brake light wire and power out on either of the wires going to the rear bulbs-if no power out, the turn switch is bad-brake pedal still depressed so you still have the signal.
Bad or borken wire harness in the steering coloum. check power to brake switch, should have power on one side, if not check the fuse if fuse is good and you have no power then your turn signal switch or harness is bad.
CK THE BRAKE LIGHT SWITCH ON THE BRAKE PEDAL FOR POWER IN & OUT WHEN ON THE BRAKE.IF IT IS OK U MANY HAVE A PROBLEM WITH THE TURN SIGNAL SWITCH.POWER GOES THROUGH THE SWITHC TO THE REAR LIGHTS.WIGGLE THE TURN SIGNAL SWITCH WHILE STEPING ON THE BRAKE IF THEY LIGHT OP THE T/S SWITCH IS BAD.
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