I have a 1995 GMC Suburban. The rear HVAC blower motor started running continuously (even with the ignition switch off) and I unplugged the wires that go to the motor to prevent the battery from running down. I could usually plug it back in later and it would be fine. I considered putting a switch on that wire but before I could it quit running at all. I tore open that area so I could access the 3 relays in the back and replaced all of them with new ones. Nothing changed, the motor still will not run at all. I pulled the resistor from the underside of the duct between the blower and the coil. It looks fine but there is current running to it at all. The meter shows no current running to the motor on any of the 3 speeds. I can hear each of the 3 relays click when I change the motor speed switch on both the front and back seat controls. I get no current on any of the heavy wires running to the relays. There is a heavy black and red pair of wires coming from beneath the head liner down to the relays. I unplugged it and got no current on either end. It seems that there is no power coming from the front of the vehicle. I have checked all the fuses in the panel and under the hood. I am not sure what to check next. I would really appreciate any suggestions and guidance that can be offered.