Tail lights don't work when you turn on the headlights. But otherwise the tail lights work fine, hazards, brakes, and turn signals work normaly but the tail lights don't turn on with the headlights.
Could be the headlight switch.
The switch has two sets of contacts for the parking lights, the park position and headlight position.
You may need to check the circuit at the switch to see if you are loosing power when the switch is moved from park to head.
SOURCE: 2006 Pontiac Montana rear brake lights and signal
check the ground in the fuse link also take out the rear tail light lens and make sure you don't have a broken or damage wire on the socket itself
SOURCE: Tail lights not working on 2005 Pontiac Pursuit
Either there is a short from switch to relay to lights or the bulbs are shot or sockets have the short
SOURCE: 2002 Pontiac Grand Prix GT headlights no power
clean the computer lead interface. my buddies car did the same thing, we cleaned the computer leads with a good eletronic spray cleaner and it fixed the problem.
SOURCE: i have a 95 pontiac bonneville ssei and the tail
you have a dead short in the wiring harness. Easiest way to diagnose is remove tail/parking bulbs and systematically replace them one at a time. When you replace them, not buy new ones just unplug them, your problem circuit will be when the lamps go dim. That's your short.
Let me know how it goes!
P.s. is the 666 because of the 3 b's in bobbie? Carefull, one's irthday is 12,22,12 may get upset. lol
SOURCE: Brake light/turn sigs dont work.But lights are on?
Ok, GM had a problem with their hazard light switches in the years of around 2001-2005. These caused some bizarre workings concerning the hazards, lights, turn signals, etc. The circuits overlap, and when the switch malfunctions, it makes for some odd happenings. Normally, when the hazards are on, they cancel out the brake lights and the turn signals, since they use the same circuits. The normal taillights use a different filament in the same bulb, which is why they light up brighter when you press the brakes. The aftermarket has come up with replacement switches in response to these inherent problems, so do not get your switch from GM. Places like RockAuto.com will sell these, though not necessarily this place, it's just the one I use. Usually, GM put these in the steering column, so replacement can be tricky for the average person, as it involves taking apart some of the steering column.
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