First step (and usually the last on a problem like this) is to turn on the emergency flasher switch with the car off and other lights off. Look closly at both sides and look for a difference between left and right. You will be looking for a difference in the lights that are flashing and the brightness of the lights. If you don't see any difference, turn on the parking lights with emergency lights still on. Again look for any difference in the left and right. If you still don't see a difference, start the car and have some one hold the brake peddle down.

99% of the time you will see something that is different and then know where to start looking for the problem.

Let us know what you see.

Paul

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84 500 SEL (307,xxx miles)