My truck isn't starting after replacing the starter, need troubleshooting help?

Sounds like the starters drive is not engaging (not jumping out when it is energized). Remove and bench test

something IS wrong with your starter.

WHAT DID THE OLD STARTER ACT LIKE? NO SOUND, JUST CLICK OR WHAT? WITH TRANS IN PARK OR NET. AND PARK BRAKE ON JUMPER BATT. POS. TO SMALL WIRE ON STARTER ENG. SHOULD TURN IF BATT. FULL CHARGE AND CABLE GOOD! IF IT DOES NOT THEN STARTER IS DEFECTIVE!! USE A WIRE ABOUT 12 TO 14 GA. FROM BATT. POS. TO SMALL WIRE ON STARTER. IF YOU CAN, HOOK TO STARTER FIRST THEN TOUCH BATT. POS.