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I am wondering if you have a bad ground wire.
Each tail light/brake light had a separate ground wire, that is supposed to be hooked to the ground somewhere.
If it is bad, those lights will not work.
Your center light probably has a separate ground wire.
If you take an electrical meter, test the bulbs with a meter, then stick the meter's contacts inside the socket and press the brake pedal and see if the meter shows "juice".
Often a car wreck/fender bender can break or compromise the ground wire of which I spoke.
God bless your efforts.
Have had this problem many time's here at my shop, if center brake light come's on which you said it does, fuse and relay are good, the problem is your turn signal switch cause the brake light circuit goes through the switch, the switch is bad even though the turn signal's still work's, good luck, hope this was evrey helpful.
Open the trunk by using the driver's side trunk release latch or by manually unlocking it.
Peel back the trunk liner to expose the wiring connector and taillight housing plastic retainers.
Disconnect the wiring connector, loosen the plastic retainers and remove the taillight assembly from the car.
Twist the turn signal bulb socket counterclockwise to remove it from the taillight assembly. Then, pull the malfunctioning bulb straight out of the socket.
Insert the replacement bulb directly into the empty socket and then twist the socket back into the taillight assembly.
Reinstall the tail light assembly.
Activate the turn signal to make sure it's working. If it lights up, fasten the trunk lining back into place and close the trunk
On the truck, are the turn signals and the brake lights using the same bulb, if the brake lights are using a different bulb the trailer might not work withe the truck if it only has a 4 wire plug, might have to add brake lights to the trailer and use a 5 wire plug, yes this means rewiring the trailer and adding lights
have you checked the earthing continuity-if it's this other bulbs may also partly light when brakes used otherwise- Check continuity of live from center to lh & rh lights and/or is there a live at those lights
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
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