Well I have a new problem, hard to start when cold, tried to to a search here but I must not be doing it right. When I turn the key to start the volt gauge drops a little, so with that in mind, I tryed to test for 12 volts at the air heater and there was none?My queastion is where is the device that says its to hot to turn on the heater for the air intake?My repair book has terrible for wiring diagrams.or any ideas what else I should be looking into?
thanks.

1997 Ram 4x4 Diesel 272000 Ks