I did not drive the car for the last few months. Have not installed the voltage regulator either yet.

So yesterday I bought a new battery, it showed 12 volts. After driving the car for about 70 miles and 2 starts, checked the voltage again with engine running 13.9 volts, with the engine off 13 volts. So my conclusion is that the voltage regulator/alternater is working fine.

As far as what was happening a few months ago, the car would click and not start, but at that time, my wife was using the car for short multiple in town trips. At that time, the new battery lasted about 10 days before the car failed to start. At that point, we stopped driving the car to avoid getting stranded until the problem had been diagnosed.

I disconnected the battery last night, I will leave it connected and drive the car for a few days and see what happens.

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Zafar
94 E320 58000 Miles