2002 Dodge Ram tailights

Pulse the brake pedal, do they go out? If you pull fuse 34--10 amp located at the integrated power module, under the hood, that should kill the tail lamps.

You may need to check for applicable trouble codes? The headlamp switch sends a signal to the instrument cluster, the instrument cxluster sends a signal to the integrated power module. On request, the module grounds the parklamp relay. That relay sends voltage to the tail lamps.