petrock

A new ground cable would help if, and only if, it is bypassing the ground connection/wire that is bad. Guessing and throwing a ground strap in some random location won’t help anything unless the planets are aligned in the right order to allow you to guess the correct location.

The problem your having is with the radio/speakers. Adding a ground from the water pump to the battery negative post or frame will only help if the radio/speakers get its ground through the engine block. I’m pretty sure that is not the case. Too much electrical noise.

The factory service manual will have all the ground locations listed in a nice diagram.

Musicsaveslives

Now I've checked all the grounds, changed the plug wires, and I had the alt checked at two different places and still I have no answer. Anymore ideas?

Musicsaveslives

And I mean no answer because the alternator checked out good at both napa and autozone