Are the wires somehow connected to cause the air conditioning compressor, the cruse control and the tachometer to function and THEN TO ALL GO OUT AT THE SAME TIME? There must be some connection to cause this to happen and then go back on for no reason. I have looked in the wiring diagrams and see no connection to these 3 units. I hope some one out there has had this happen and can clue me in. Thanks for any reply.