1999 Chevy Suburban REAR A/C

Air Conditioning problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic

My rear ac blower motor has power going to it. But
when I hook the plug back into the blower motor I
loose power. I have already tried the resistor and the relays in the rear area. What could be my problem. Also are there other relays in the front that would affect the rear a/c?