Well, I wasn't thinking of using aggressive sandpaper, I was thinking 220 grit. What exactly are the contact points made of ? Short of a mild abrasive, how does one clean the contacts.

And no, she wasn't running the radio. The engine was running and it instantly stopped on it's own. I witnessed it once while the car was idling in her garage, and then again while driving. We had just turned into a gas station and it died. My friend immediately started the car and it fired up like a champ. Then about 15 mins later as we were driving along at about 35 mph, the engine for a fleeting second died (dash warning lights on), then caught itself and continued to run.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member