On my eclipse moi relay, it doesn't send a signal to the starter. It actually reciebes a signal from the ignition or starter to actualtr the fuel pump for startup, then the ecu takes over and sends voltage or grounds something to keep it going. There is also a test connector to check fir voltage or can be used to jump the fuel pump to turn it on manually. I am not too sure how similar your wiring harness is but I would check for voltages at the relay and see if they are in specs. Not saying the relay is bad or anything but that relay is important to start and keep the truck running.