There have been several times that I have turned the knob all the way to the left (which is what I was used to) and accidentally turned on the one side lamps. It's funny, becuase there has been a couple of times that I have seen other MB's sitting in parking lots with one side of the parking lights on. Luckily the batteries are so large, that it would take a several hours to drain the battery.

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head