If you are new here, here is another "avenue". Convert to 12V, very easy. Not expensive. Get a Delco 10si alternator. No more troubles, no more generator, no more voltage regultor. Better starts. Cheaper parts. Much better reliability. No endless adjustments. bending this bending that, polarizing, and so on. Many have done it and are happy. We have helped many. Chevy converted to 12V a few months after your truck was built. So did all the manufacturers.
"All of your wildest dreams will come true." Pedro