I noticed the voltage supply was almost 12 volts to the high pressure switch with the ignition on and engine not running. So I bridged the two wires together and started the car. Fans started running and pressures went down. After running like this for a few minutes I turned the car off and connected the high pressure switch. I restarted the car and the fans started cycling when the head pressure got above 200. I must have "jolted" a relay that was stuck? Ernie