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tail lights will turn on and off by themselves with or without key
for the last few months here my bosses ford f150 has had an issue where his tail lights will turn themselves on (for up to 12 hours, or until disconnection of battery) or until they randomly decide to turn themselves off.
this can happen while the vehicle is being driven but more often happens without anyone or the key in the vehicle. so he usually woke up to a dead battery.
as of recently he purchased a battery tender that he mounted into the engine bay so he can start his vehicle every morning.
we have checked/pulled all fuses and relays we can thing to and also multiple fuses and relays in a variety of combinations but none seem to cancel out the constant signal to show as though he is in the truck holding the brake pedal to the floor.
any and all help would be appreciated