It's kinda hard to mess up that connection. It can only be done one way because the wires only fit one way. There is a little wire on a little post and a big wire on a big post and it grounds through the case contacting the engine block.
The little wire is a trigger for the starter, the big wire just feeds battery voltage for cranking.
"Having issues" does not help us help you. What is it doing? Have you bench tested it?
Bench test is really easy, only thing you need that isn't part of the truck is jumper cables.