1997 Ford Ranger charging troubles

If the light is always on, check for 12 volts on he yellow wire that's plugged into the generator. It should be there all the time. If it's missing. Look for a blown 15 amp fuse under the hood.

Caradiodoc

There is a fusible link that goes form teh alternator to the relay by the battery. It may be a gray wire going to a orange blue wire. The link may be burnt up it's easy to check with atest light or by sight. There also is a fuse inside the ip fuse panel and a maxi fuse in the underhood fuse panel check those as well.