I have had a few VERY slow crank starts and stopped by the battery shop for a load test. They claim the battery is charging fine with sufficient cranking amperage and the starter checked out fine. I don't exactly know what/how they test the starter functionality but I was told it is operating correctly. It cranked just fine when they were inspecting it. My plan is to check/clean the chassis ground in front of the battery and negative terminal when I get home. Can this be symptoms of a early starter failure ? My previous experience with starters is that it just stops cranking and a light tap might get it to crank again. is there a ground terminal on the starter I should clean or inspect ? Thanks for any insight from the board on this matter.