1995 No heat or A/C power - nothing works?
I borrowed a friends complete control panel and tried that but still nothing worked.
I have nothing operational in the HVAC control panel. The one heavy orange wire that runs to the panel does have continuous 12Volts but i cant see where as that wire even has anything to do with the power supply anyway, it dead ends into one of the connectors.
none of the switches or controls get any response.
I checked EVERY fuse in the fuse box and in the underhood relay panel.
I ran a hot wire to several of the connections at the dash and i can hear the electric doors opening and i can get each of the fan speeds??
DAVE

sounds like a bad ground possibly

I wiggled and jiggled everything originally and i still got nothing at all. I'm going to splice into the black ground wire and run a separate ground b/c I already had to repair radio wiring that was mangled and they may have originally shared a common ground wire even though the harnesses are separate. I'll let you know tomorrow evening. Seems i dont havea complete circuit and since i verified power to the controls it only seems logical that the circuit is'nt complete. thanx , DAVE

these trucks electrical systems are kind of screwy, if foung thes always have a hot lead to them and the switches break the ground so thats why i suggested that! Danny

The ground wire was not the issue. Problem continues, There is a power wire leading in that has only 3-5 volts MOST of the time. All of a sudden the voltage will spike up to 12Volts and the control will work and the blower fan will come on?? If you change any of the knob settings it will kick back off and you won’t get it to come back on until ?????. If you leave it alone it will continue to run for however long??? WOW I’m confused . the low voltage is over at the fuse box also so I need to find out where the fuse box gets it power feed from. I suspect something bad in the relay bnox under the hood but i already changed that out and no difference.
DAVE