On most vehivles the live feed for the taillights brances from a connection in the back of the trunk. It is probably a poor connection or damp in this junction. If the whole cluster isn's working it is probably a poor earth.
I'm thinkin' the headlight switch is at fault.
There could be a couple of reasons why the headlights won't work when the other lights do. One reason could be a blown bulb. Another reason could be a problem in the wiring.
first check the ground wire on the tail lights make sure it has a good ground. if that does not work then its a short somewhere in the car. ANSWER Your brake light switch could also be faulty and that could trigger your brake lights from turning on while your engine is off and all other lights off as well.
Taillights are red lights at the rear of a vehicle that indicate its presence and signal braking. Emergency flashers, also known as hazard lights, cause all turn signal lights to blink simultaneously, alerting other drivers of a potential hazard or that the vehicle is stationary. Parking lights are used to make a parked vehicle more visible to other drivers, typically activated when the vehicle is stationary and not in use. Together, these lights enhance safety on the road by improving visibility in various situations.
Check your fuses. One is probably blown out. If that is the case you might check the trailer light hookup if you have one.
Check stop light fuse Check bulbs (double filamented smaller filament is for stop lights larger for taillights) Check alignment and operation of stop light switch
As I recall, there is no relay involved in this. When you say dashlight, you mean the lights on the guages when the headlights are on? (gauge illumination) When you say taillights, do you mean the 'running lights' that are on when the headlights are on, or the brake lights? If you are describing both running lights and guage illumination, then that would point to faulty light switch, loose ground wire under the dash, or fault in supply wiring. The gauge illumination has a dimmer module which can be faulty (but very unlikely to affect exterior lights) If one of these is the gauge illumination, and the other is the brake lights, then this would point to a faulty ground wire connection as the supply circuits to these two functions is not common.
On the other side of the tail lights, inside the trunk fastened with plastic nobs, pull back trunk trim panel.
This is usually a grounding problem. Either an insufficient ground to the assy or a positive to ground problem. As you mention the brake lights work with the lights off, it will probably be related to a problem with the "running lights" system. As you mention only a problem with the passenger rear, I would check for a poor ground related to that light assy or possibly one of the bulbs' internal filaments in that assy touching each other. Or possibly a socket failure at that assy. Good Luck
Short to ground.
humm, This is strange because the DRLs (day time running lights) usually function from the same bulb as the headlights, in other words the headlights are always on so people dont forget to turn their lights on at night so if this is the case you have no problem. The only thing that might indicate a problem would be if the dash lights do not come on when the headlights are on, If this is the case then the turn signal switch could be at fault, otherwise I see no problem with the lights. Granted this could be the case or not but based on the question this is the best diagnosis I can provide, Good luck and I hope this helped
Check the bulbs they are double filamented and filaments may be touching each other causing a backfeeding situation through the stop light circuit.