Before selling, have it diagnosed correctly. The alternator is more likely the $50 voltage regulator. Getting your AC charged may solve your problem there, and the headlights could be the bulbs. That's worth fixing even if you're selling - I wouldn't buy a rat's nest when there are plenty of working '96s out there.
One thought - your rodent friends could have chewed some wires - very common problem in Germany (ask any German about "
Marders")