You have to view electrical wiring diagram's an test the electrical circuit's with a DVOM - digital volt ohm meter . Pontiac van ? Montana ? Do you know what a automotive electrical wiring diagram is ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine size. Then under system click on lighting , then under subsystem click exterior lighting . Click the search button then the blue link . Check the stoplamp fuse 15 amp . check power at the brake light switch etc....
Watch these video's .
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
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This is how professional auto technicia's fix electrical problems , training , testing .
SOURCE: the tail lights are out, so the brake lights-Jeep Grand Cherokee
i have a 2002 jeep grand cherokee i had the same problem when i would apply my brakes when the headlights were on my brake lights would go out, i found that my bulbsocket was not making good contact with the socket housing, if you notice when you take off a bulb, look at the light fixture where you unscrewed your breaklight bulb you will notice 3 medal contacts-they should be silver in the socket housing and like a copper on the socket bulb, in the socket housing their should be 2 silver contacts together and 1 by itself the one that looks by itself is making bad contact with the copper one thats by itself on the bulb, what you can do for a quick fix is; get a small piece of low cage wire or a thin piece of metal like copper stick that in to the bottom or top of that metal contact--i did it through the bottom leave the wire or piece of medal sticking out enough for where it can get contact with the bulb (just a little wire is enough to make contact, now screw the bulb on and test it---it will work----i did it to mine, if you need more assistance let me know [email protected]
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: 2006 ford e250 van\r\rear tail lights dimmed and now dont work(.)
check the fuses and relays under the hood next to the battery. if they still dont work it might be in the wiring or if it has a tow package it might be in the trailer wiring
SOURCE: 2000 Nissan Maxima. Headlights work but tail lights won't.
your dimmer switch is the proublem it is loose or just worn they wear even if you dont ever use the switch a common nissian proublem iv had the same issue
SOURCE: My 2003 Pontiac Vibe tail lights do not work. The
Your turn signal lights and brake lights are the same lights . Question : do the front parking lights work ? The front and rear running lights or parking lights are all on the same circuit and fuse . If the front lights work , and the rear lights don't , make sure the bulbs are good first . If OK , I would suspect the problem is either a bad ground in the rear taillight wiring harness or a bad connection in the rear taillight connector Itself .
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