I have a 93 Chevy c1500 4.3v6 pu. Sometimes when I turn the key to start it, all I get is a single click. It may do this 1-3 times and then start. I had the alt and batt checked. The alt was fine, the batt was weak, so I replaced it. It is still doing the single clicking when you turn the key. Any thoughts? Thanks for any help.