Okay since you have no humor
...these cars are so simple.
Powermaster's are excellent products, doubt anything was wrong with it. A bad bearing will make noise for a long time before it seizes. A loose belt won't ruin a bearing, a tight one would.
Why would you think a ground is the problem if it worked fine for a long time?
Where does your tach signal come from? Your MSD box? hmmm...