Sounds like you may have a blown fuse for the pink ignition hot wire going to the cluster.
That would make alternator terminal 1/field try to send power (through the ALT light) to components that the igntion switch is suppose to power.
Alternator charging, it takes two hot wires to make the ALT light stay off. Hot from ignition and hot from alternator terminal #1.
Alternator terminal #1 switches from ground to hot when the alternator is charging. Alternator not charging, terminal #1 provides the ground to turn on the ALT light.
Did you get that?
Clay
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