Hi Everyone:
I have a 1971 911T that is refusing to start and would appreciate any thoughts or suggestions.
History:
1. Last summer, I had a no-start issue and replaced the seven year old Porsche batteries with a pair of new Sonnenscheins. All was well for a few months.
2. But, as I drive the 911 less frequently, I would find it dead (no crank) after it sat for a month.
3. All was well again after charging the batteries back up and/or using my Noco GB40 for a jump.
4. Earlier this year, I suspected the clock was over-winding, so I disconnected the clock and after sitting for 6 weeks, it fired up no problem.
5. I sent the clock out for repair (it was over-winding) and left the clock plugged in after it returned from the shop.
6. After being fully charged and sitting for another month, the car is dead again.
Key Facts:
A. Upon finding the car dead (no crank at all), I hooked up the GB40 to the passenger battery. It cranked, but it was weak and wouldn't start.
B. I pulled the batteries out for a bench charge--passenger was completely dead; driver was 70%.
C. Reinstalled the batteries after the bench charge only to find that it wouldn't crank.
D. Hooked up the GB40 to the passenger battery and got it to weakly crank, but again, no start.
E. When attempting to start, the interior light flicker on then off. Not just a slight dimming.
My gut says the passenger battery is a dud (brick), but what gives?
Thanks in advance.
