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Replacing the plug at the alternator is something I have done on all of my trucks. I didn’t even think about it in this thread. Sorry. I’m going to write it again. Trace every single wire in the diagram posted above and clean every single connection. You didn’t mention if your glow plug...

You didn’t mention the Double E thing earlier. That makes it easier to write you. Have you a way to measure the ALT 2 voltage while driving? Going on the something loose theory I wonder if what is loose is a contact blade at the big plug on the rear of the gauge cluster. Or, the main fuse for...

14.4 volts is considered max output for an alternator. You seeing closer to 15 volts to mean means resistance somewhere or since the light flashes intermittently. Something loose somewhere. Have you had a chance to remove, clean with sandpaper and or nail file and then re attach every single...