Actually, the real fun with the 49D is the positive cap, which continually pops off due to the multiple leads running from various locations off of the body harness positive terminal. The thing should, theoretically, be capped. While reinstalling the pass side rear power seat on an E32 a few weeks back, I managed to momentarily ground out the battery because of a missing positive cap -- silly owner had destroyed the seat base by using force instead of a brain to remove it. That's a rare occurence, but still par for this course.

best, whit