1998 Dodge Caravan Q&A

1998 Dodge Caravan Question: Voltages at wiring harness pin inserts?

Does anyone know where I can find a schematic that would tell me what the voltages should be at the heater control wiring harness pins, and cluster gauge voltages at the harness? Or perhaps give me a place to look for problems, since my gauges stop working when I plug the wiring harness into the back of the heater control module. -
Answer 1
since we answered this before, couple of questions. is the head new or used?? what is wrong with the old unit?? Roy -
Comment 1
My heater control module quit, and changed it with another used unit that was taken from an accident vehicle. When I plug the A/C Heater controls in, the gauges quit working. The heater controls work fine and no faults come up with self diagnostic, but I am wondering how the gauges are affected by plugging that in. No amount of banging on the dash does anything to activate gauges. At the moment, I am just running without the heater controls plugged in (only the fan is powered for defrosting on cold mornings) so that I have the use of the gauges. I did notice the other day that even running it like this, the gauges quit again, but came after a thumping on the dash. Maybe I have more than one problem alone here? Will most likely have to bring it in for testing, I guess. -