Do you have a volt meter to check a couple of things?
Ok, The large battery wire at the alternator.....can you tell me the voltage reading on that wire.
Also, the 2 wire plug that goes into the alternator, can you tell me the voltage on each of those wires with the key in the on position.
Here is a pic of the charging circuit.
The brown wire at the alternator is only supposed to have 2 to 4 volts on it because they are using a resistor wire to lower the voltage.........unless this has been bypassed?? if you have 8.9, then we'll go with that.
Now if you do not have 12 volts on the other wire. then according to the diagram, you probably have a bad fusible link up near the starter relay
Also be sure and test all your fuses. There should be one or two fuses in the underhood fuse box that relate to the alternator.
Ok, the power distribution box was brought into play in late 90 or early 91 so maybe you don't have that. The fusible link I'm referring to is a section of wire that is designed to burn or melt and according to the diagram it is between the alternator and starter relay on that wire with zero volts.
No, I'm not expecting to find a bad starter relay here.