Hello, my truck was running fine until it would'nt start. I turn the key and you can hear just a click, not sure where it is coming from. I replaced the relay on the passenger fender, replaced ignition switch, and took starter to fruitcakes at autozone. The guy tested it twice and told me it was bad, then said he had it connected wrong and tried it twice again, and said it passed. So i'm not sure if the starter is eliminated yet. Batteries test good. What else should I check? How do I check the two relays by the idm?