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I have a 1992 Saab 900 with automatic transmission.

One day in December, I was driving to my apartment at school and everything suddenly started to shut down one by one...first the HED unit I never use beeped as though the car had been turned off, then the headlights went out, etc. Eventually, I lost the ability to accelerate and rode the rest of the way home on momentum, getting halfway in a parking space before the car stopped completely.

The local Saab dealership replaced the alternator, saying it had failed and had been in backwards...although my mechanic at home (a Saab specialist) had just recently adjusted the alternator.

A couple weeks later, on my way home for Christmas break, the transmission stopped shifting when I got off the turnpike and I had to ride the rest of the way home in first gear at about 10mph. I checked the transmission oil and it was fine. I ended up not having time to do anything about it, and returned to school in my other car. Now that I am home for the summer, I took it around the block after it's been left sitting in the driveway all semester, and it seemed to shift fine. The next day, however, the car would not start.

Could there be some connection here with the intermittent transmission problem? The car has had a new starter, a new alternator, and now might need a new battery...could there be some electrical problem?
 

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No there is no connection. The autobox is an entirely hydraulic unit, save for a kickdown switch in the acclerator pedal.

Did you notice a red "battery" light before the ancilliaries began to turn off?

Would be a good idea to change the transmission fluid (Type F only!) and do a band adjustment. Also do an adjustment on the shifter linkage for fun ;)

Did the car have any battery power? (ie bright lights when you turned the key?) After getting such a hard hit as being drained to nothing and then sitting, it might be dead.
 

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900t said:
The autobox is an entirely hydraulic unit, save for a kickdown switch in the acclerator pedal.
There's no switch--kickdown is handled by a cable attached to a crank on the throttle shaft.

Regarding the electrical problems, first thing to check is that the alternator ground wire has not burnt out or broken!
 

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ProfZ said:
Regarding the electrical problems, first thing to check is that the alternator ground wire has not burnt out or broken!
I had similar electrical weirdness and ProfZ hizzelf pegged the issue as a faulty alternator ground. Worth a look!
 
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