Starter conections, sometimes the wires fray and make contact with the housing of the terminal or the undercarriage. Acc/on/off tumbler in the ignition has become sloppy and making duel contacts. Or simply always running acc. No ground to stand on, just a couple things that have breezed by me in the past. Good luck. Any thing else off the wall I can think of I will get to you. Blend door actuator motors continuous run. Sensor wiring chafed. Radiator thermostat temp sensor malfuntion,