Is it the tail lights ,or is it the brake lights
? If it's the brake lights at the
brake.pedal there is a switch that
completes the circuit as the pedal is
depressed they occasionally wear out
but most of the time the clip that holds it
in place tends to break .if it's the tail
lights first determine the parking light
circuits are operating . I.e. are the front
marker lights on ? If they are on then
the headlight switch is most likely not
the culprit. In my experience on trucks
and suburbans etc. They usually have
trailer light connectors .some are hard
wired into the harness at the rear of the
vehicle .some are harness TS (plug n
play ) those Ts can become faulty amd
cause lighting issues .if someone has
cut or tapped into the tail lights it's
possible that the connections came
loose or were incorrectly wired . I'd say
in your case that's about a 70% chance
.Good luck
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