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So let's get this straight...
Battery Voltage = 12V
You jump-start the engine and Battery Voltage = 6V
Engine Dies and Battery Voltage = 12V again.
Correct? If so, you have an alternator or battery issue. Probably bad diodes or a battery hooked up in the wrong polarity. There is no reason why the voltage should go DOWN when the engine is running.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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