Question about 1993 Ford F150 SuperCab

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The tail lights dont work at all, the brake lights and turn signals dont work when the front lights are on. when i use the turn signal they both flash like the hazards do. any help

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Check your fuses first. Your brake light switch could be bad and your flasher.. Good Luck!!!!

Posted on Nov 10, 2010

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08 Buick lucerne cxl. Third brake light works as well as front signal lights. No rear brake lights or turn signals. Tail lights and headlights and third brake lights works. Bulbs good. Help


Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.
Ground for the stop lamps is supplied as follows:
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• G301 provides ground for the CHMSL
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.
Battery voltage from the LT TRN/SIG and RT TRN/SIG fuses located in the rear fuse block is also used by the body control module (BCM) for stop lamp operation.

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps

Do you have a factory scan tool (tech2) ? Your best bet , take it to the dealer .

Sep 08, 2017 | Buick Cars & Trucks

1 Answer

1996 chevrolet 1500 brake light and blinkers dont work


a bad turn signal switch the brake lights go threw the turn signal switch

Aug 26, 2012 | 1996 Chevrolet C1500

1 Answer

Chevy S10. When my running lights are on everything works (except turn signals), front lights, tail lights brake lights. When I turn on my headlights turn signals still dont work everything comes on fine...


Check the grounds on your wiring.
If you have a trailer harness, make sure there are no shorts, or crusty connections

Good Luck chasing the gremlins

Oct 13, 2010 | 1996 Chevrolet K1500

1 Answer

On 2002 jeep laredo brake lights dont turn on if lights arent on


That does not make any sense. Do the tail lights work? There are supposed to be separate filaments for brake lights, tail lights, and turn signals. In particular the center brake light should not be possible to be confused with tail lights or signals. Does it come on? If not, then you probably have no brake lights at all, and that is probably because of the bad fuse or the switch on the brake pedal for the brake lights.
If there is some sort of cross over between tail light and brake lights, that is usually from a bad light socket ground; which results in current backing up from one system to another. But then each is usually only half brightness.

Jul 20, 2010 | 2002 Jeep Grand Cherokee

1 Answer

Running lights work but no blinkers or brake lights. Changed fuses and bulbs no luck


I'm inclined to believe it is the turn signal switch. When you select left or right, the brake light is removed from that side, and the flasher is connected to the bulb instead, making the brake light on that side flash as the indication that you plan to turn. You have lost everything, but the simple answers check out.

If you have lost signals, brake lights and tail lights, then it is more likely that the ground supplied to the bulbs is not working, since the tail lights share noting in common with the brakes lights and turn signals but ground.

If the tail lights work, the fact that the brake lights and rear turn signals share that switch starts to look meaningful — even more so if the front turn signals also don't work. But the front signals and the rear signals use different circuitry in the switch, so it would be something more mechanical in the switch than electrical in that case.

Jun 24, 2010 | 1991 Buick Regal

2 Answers

Tail lights work on both sides. turn signal and


Sounds like you need to replace the drivers brake/tail light.

Dec 14, 2009 | 1998 GMC Sierra

1 Answer

2003 ford expedition tail turn signal light dont work bulbs are ok


You say the rear tail turn signals are not working are the fronts working? If the fronts work and the rears don't then you have a wire issue. Check the grounds for the tail lights or check and see if a trailer wire harness was put in by splicing the wires. Also check for brake lights and see if they work should be same bulb. If the fronts do not work either check fuse 18 in the fuse box should be a 10 amp or check brake fuse 2 which is a 20 amp

Jul 06, 2009 | 2006 Ford Expedition

1 Answer

Rear taillight problems


I had the same problem with my 1996 Mystique about a year ago. The brake and tail lights stopped working, except for the center brake light in the window. Turned out to be oxidation of the terminals at the connector on the turn signal. Yes, that's right, turn signal. The electrical signal to the tail lights goes thru the connector on the turn signal. To fix, I cleaned the contacts and the brake lights started working again. Hope this helps. Cheers, Henry

Nov 25, 2008 | 1998 Mercury Mystique

1 Answer

Tail light is out, brake and turn signal work


create your own earth wire off the original and screw/bolt to a good earth source.Nothing flash just a test if it works make a more permanant one

Oct 11, 2008 | 1998 Cadillac DeVille

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