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Well, best advice I can give you now is to find a factory service manual for your car. There are links on the boards here to online sources for these if you search. Hunt through the wring diagrams and find the wiring for the dash lights and pull out the cluster and poke around with a VOM at the wires that are supposed to be giving power to the lights. Then you get to figure out where the power is coming from, if it's not coming from the light switch.

 

One thing that can cause some funny issues is a shorted filament in one of the brake light or turn signal bulbs. One filament burns out but then falls and makes contact with the other filament in the bulb. This feeds power through the working filament into the circuit of the burned out one and can cause other lights in the same circuit to illuminate.

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