Yes, the battery goes dead while driving the car. The battery was brand new, fully charged, and 100 KM into a trip, while traveling at 100 KPH, the tape player turned off automatically, the heater fan slowed down, so I turned off all electrics, except the lights (it was night). Driver's seat heater was on low when the tape player stopped. I made it about 40 KM to a gas station, and the battery was practically dead, where the battery was recharged.

The bulge in the wire is about 6-8 inches from the alternator.

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1989 420 SEL