As i turn on the headlights which work perfectly, the passenger side high beam fails until i put the highbeams on. When I pull the lever to "flash" someone, the exterior light failure light comes on, and both headlights illuminate. When I push the lever to keep on the high beams, the exterior lights failure comes on and the passenger side headlight completely goes off. What could be the problem?? Bad bulb??

Agron
1989 300E (107k miles)