Quote:
Originally Posted by oldie44
I had a similar problem many years ago with a 356 which was due to a current leak on one of the circuits. With a 1971, there should be no current flowing through any circuit with the exception of the clock when the ignition is turned off.
I suggest you pull fuses one by one and check for current flow with a mulitimeter. If any show a current draw, check/disconnet items to see if you can identify the short circuit. The clock should draw current intermittenly as it winds.
If all circuits are OK, look at the unfused circuits by disconnecting the battery and checking across the connection. One problem can be a defective diod in the voltage regulaor allowing reverse current when the motor is not running. Also, the wiper motor on the early 911s were not fused. I don't know about your 1971.
If your car has an alarm system or new sound system, that should be the first thing you disconnect to look for current leaks.
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Thanks, Olide44. A trace for draws is a good suggestion is something that I have been considering, but putting off in hopes of an easier solve. There aren't many electrical components in these old cars and I have not added anything of note.
A clue that would suggest all is well is the longer period in which the car was parked but the clock was disconnected. It started without issue. That prompted me to send the clock out for repair. John Bell confirmed the clock was misbehaving and would have been killing batteries regularly.
Alas, I will work to get my Sonnenscheins replaced under warranty and go from there.