Hello I have a 1990 Bronco XLT with the 5.8 and I’m having problems with my alternator not charging the battery I’m only getting 12v while running and after driving for a bit the battery volts decrease. I replaced the alternator and ground battery cable, and battery still same issue. Then I replaced the harness thinking it would change it but it only made a slight difference but still not enough volts to charge the battery. My battery light is on and doesn’t turn off. If anyone could help me in any way I’m trying to diagnose the issue I’m having, it would be much appreciated.