I need to know the steps for uninstalling, and reinstalling the alternator on a 1989 Volvo 240 DL.

Steps

1. Disconnect the battery
2 Loosen botls so you can remove the drive belt to alternator.
3. If it has a serpertine belt, then pry with proper tool on the tensioner to remove the belt.
4. Disconnect harness to alternator and ground wire if any and filter condenser if any.
5. Loosen bolts to alternator and remove alternator.
6. If AC equipped, not knowing your belt configuration would require to loosen the AC Belt also, depending if your alternator belts is the first one near the engine, then all belts have to be loosen to remove it. unless #3 applies.
Reverse the steps to put it back on.