Blower motor power supply is from Fuse # 1 and # 2 in fuse box with ignition ON. At blower motor, test blue wire for battery voltage. If voltage is available, ground the Blue/White wire and if motor works, power supply to blower is good.
You need to test the blower switch. Turn to maximum speed and if blower does not work, at blower switch ground the Black wire ( terminal # 6) and if blower works, you have a bad grounding circuit.