AC and blower do not work after warm up, dummy ligths come on

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I have a 1996 3.2L trooper. This just started happening not long ago. After the vehicle is warmed up the ac/blower shuts off and the dummy lights for the 4X4, Brake and Battery come on. If I stop using the car but do not let it cool down the fault continues, once the car has cooled down and I re-start it and turn the AC back on it works again for about 5-7 min until the engine is warm again and it shuts down. I need some help, I am a backyard mechanic but I am not very good with electrical problems. I have studied the electrical diagrams and can not find the criminal. :(