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I'd check for a battery drain. It sounds like something is amiss while the car is sitting overnight.
Just for comparisons, here's the standby current drains in two cars spanning your model year.
1984 (with the broken clock disconnected):
0.372 ma (i.e., 0.000372 amps)
1993:
7.8 ma (i.e., 0.0078 amps) without clock (~ 2.8 mA of that just for the radio's memory, with the rest for the OBD-1 memory, I presume)
~12 ma (pulsing briefly to 25 ma), with clock operating (along with radio and OBD-1 memories)
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