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I had this problem some time back. Your FR & FL bulbs, respectfully have to be the same current, and voltage. Same for the RR & RL. Your best bet is to spend the $20 or so, and replace the front, and rear bulbs. If they don't match, you will have this problem.
My problem was when braking and turning, either right or left ( don't rember which), the bulb out light comes on. Since it only occured while braking, I Relaced my rear turn lights with two new. Never had the problem again.
1990 740 Rex, 212K miles
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