I went out this morning to get into my 1997 3.3 liter Dodge carvan and the battery was deader than a door nail. I hooked up the charger and the cooling fan(s) started. I took the cable off the battery and am trying to charge the battery now. I assume the fan never shut off and drained the battery. The wires to the fans were free and not pinched anywhere. Where is the sensor that controls the fans?