Question about 2003 Ford Mustang

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Hi, I have power to back up lights, turn signals and tail lights, but no brake lights, what should I check? Joe

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First try a new bulb on one side of the brake light at the rear if still not working then i suspect it will be the brake light switch assuming your fuses are all good.

Posted on Nov 13, 2010

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The dash and tail lights are on two different circuits, and the brake and turn signals are on different circuits, so at least 4 circuits total.
I would start at the headlight switch and check for power on the first two issues.

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The turn signals and brake lights use the same circuit and filament in the bulbs. The tail lights are on the other circuit which comes from the headlight switch.
Do you have power on the tail light fuse ?

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In the underdash fuse/relay box, the 15A TAIL fuse feeds power to the coil of headlight relay 2. When the combination switch is set to TAIL, the relay closes and the outer tail lamps light. In the same underdash fuse/relay box, the 20A STOP fuse feeds power to the brake light switch. When the brake pedal is pressed, the inner brake lamps light. The underdash fuse/relay box also contains the 10A TURN BACK fuse which feeds power to the hazard switch and the turn signal relay. Relay output is fed to the combination switch and turn signal power is applied to the selected middle tail light. The fourth fuse in the underdash fuse/relay box is the 15A HAZARD fuse which feeds power to the hazard switch and turn signal relay. When the hazard switch is set, the turn lamps on both sides begin flashing.

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I have a 2000 chevy 2500 and the tail lights, tag lights and brake lights have stopped working, I checked the bulbs and they are good, fuses are good. Have not replaced the brake relay under the hood. Do I...


check for power at the wires going intop the tail lights, real common that the circuit board is bad, but unlikely both at the same time. The tag, tail lights and brakes are 2 different systems. Do the turn signals work normally? if so the wiring from the turn signal switch to the brake lights is GOOD. the stop light switch had\s a ORANGE wire that should have 12V if not ck STOP LPS fuse, when brake pedal is depressed, the WHITE wire is 12V (at the stop light switch) if that is OK, the turn signal switch COULD be bad. The wiring harness plug is near the back left under the tailgate, see if that is disconnected?

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Back turn signals aand brake lights are out, but the the tail light s work. What does this mean and how can i fix it. i checked the fuses and did not see any burnt out


Because the brake and tail(or running lights) are two different circuits. You should find that the stop and turn-signals have their own fuse. Even if the fuse looks okay it may not be. But if you replace the fuse and it still doesn't work try the four-way flasher. If the lights in the rear flash and the brake lights still don't work. Your problem then becomes a power distribution problem. If you know about test lights and troubleshooting this type of problem check for power at the connections for the stop/turn-signal fuse. The power side of the fuse should be the one that has two wires hooked up to it.

Jan 04, 2011 | 2005 Dodge Caravan

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No brake lights in tailight assm. 3rd brake light works correct


It goes straight from the switch to the tail light circuit
make sure you don't have a bad tail light socket

Apr 25, 2010 | 1995 Chevrolet Camaro

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What is the correct colour code for Canadian Trailer hitch wiring? I know white is ground, brown is tail lights, Yellow and Green are Signal lights but which side?


Hello. Actually the color code for trailer hitches is universal.
  • White - Ground
  • Brown - Running (tail) lights
  • Yellow - Left turn/brake light
  • Green - Right turn/brake light
Regards, Joe
PS please rate my answer.

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1996 Chev Silverado K3500 dually, no brake lights


Check at the light socket in the rear, where your lights don't work. You need a test light or a voltage meter, and check to see that you have a groun there, power for your parking light, and power to the brake light. You should have power for the parking lights seeing that it works, and a ground. Just verify that your power for the brakes is getting to the bulb, or not. Just a good place to start.
And you are correct that if the third brake light works (top) your brake light switch is fine.

Aug 19, 2009 | 1996 Chevrolet C3500

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Rear brake lights don't work


you prob got a trailer plug prob bad wires if not tail lights run through turn signal switch tell fix ya bout me ok

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