common for E39 if theres any dielectric grease or any type of dirt inside the bulb socket the risistance values change and set off the light..
just pop open the rear lights and have a look take the bulbs out and clean out the sockets, the problem should be fixed..
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you know your not paying attention when this happens:
<div class='quotetop'>QUOTE</div><div class='quotemain'>Are you refering to his Signature? oh shit, i just remembered i used my name in my sig... I just 0wn3ed myself. </div>