Unplug the starter relay, use jumper wire between terminals 3 and 4, the starter should crank, no need to crawl under the vehicle. Just make sure the tranny is in park or neutral and the e-brake is set.
In the diagram, terminal 4 is hot all the time. When relay is energized, that line with the arrowhead moves to terminal 3 and carries voltage to starter solenoid. The coil side of relay is what causes the relay to energize. Voltage for coil side of relay comes through neutral switch. Ground for the coil side of relay is through anti-theft system, where applicable. I looked at a trooper limited. If all voltage and grounds are good, suspect the relay.
Tuesday, August 2nd, 2011 AT 2:15 PM