回複：Do you mean BMW car itself or BMW owner ?

It is fundamentally correct that the alternator has to produce more electrical power than the car consumes. With a sophisticated electrical system as a BMW has, however, the battery functions not only as an energy reservoir, but also as a HUGH capacitor to smooth out voltage spikes. Suddenly disconnecting the battery while engine is running, we are expecting a voltage surge which is very much undesirable or even dangerous to modern computer controlled electronics. Please search Google by typing “disconnect the battery when a car is running.”

Nevertheless, this technique is quite useful and efficient for older cars without using on-board computers.

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• Thanks whz1234 for those information. You are right the battery -Happy-DIY- ♂ (899 bytes) () 05/24/2009 postreply 20:36:29

• 回複：Thanks whz1234 for those information. You are right the batte -whz1234- ♂ (150 bytes) () 05/24/2009 postreply 20:49:05

• Believe or not, it's up to you ... -Happy-DIY- ♂ (467 bytes) () 05/24/2009 postreply 22:29:40