You would remove the plug off the blower motor, take a test lead or piece of wire, attach one end to the positive battery terminal, and touch the other end to the blower motor terminal. Most likely you'll hear a snap, don't drop the wire. But after the snap you should hear the blower motor running.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.