Don;
Thanks for the tip. No, everything was not normal before I started my upgrades. The needle always dipped toward discharge when I would turn on the headlights, especially on high beam. I didn't really think much of it until the other night when the needle went so low and never came back up. I don't think I caused the problem.
On a related note: what is the function of the voltage regulator mounted on the firewall? If my alternator is internally requlated, is the firewall voltage regulator not needed? I have a new one in the box that I bought sometime in the last few months. Maybe I'll swap it out tonight and see if that changes anything. If I have time this evening I'll go out to the garage and run the truck with varying degrees of electric items turned on and just messure voltage everywhere that makes sense.
More to follow...
