There isn't a dedicated fuse for the alternator on a 1994 Oldsmobile Achieva. The alternator is directly connected to the battery and the charging system is regulated by the alternator itself and the voltage regulator (which is either part of the alternator or a separate component). Problems with the alternator charging system will usually show up as a blown fuse related to other components, such as the radio or interior lights if the alternator is overcharging.
If you're having charging problems, the issue is more likely with the alternator itself, the battery, the voltage regulator, or possibly a wiring problem, rather than a blown fuse. You'll need to have a mechanic or auto electrician diagnose the problem.
