OK, where to start. Basics, 79 Bronco, 351m, alternater showed signs of failure, tested it, it failed. bought a replacement, installed, it failed. Truck not charging. All of a sudden, almost everything electric in my truck went out. Radio, courtesy lights. But not headlamps or exterior lamps. replaced the voltage regulator and alternater. Still no charge. Checked fuses, all intact. Checked all ground connections, all intact w/ no interuption. I am lost. I need help. Any ideas???????