I have a 2001 XLT, the rear blower will not turn on with either control. Fuse 7, & 114 ok. Blower runs fine when hooked up to 12 volt power. No power on any wires that go into the fan speed controllers on both. Temp & position controls seem to work, I can hear stuff moving in back when I turn them. Is/are there relays somewhere that could be bad... really stumped on this one.