is electrically connected in series with a resistor 330 the resistor 330 is electrically connected to connective member 342 connective members 340 and 342 may comprise clamps such as alligator clips fig4 provides a perspective view of one embodiment of a short locating tool 400 including a protective member 410 at least partially covering a ptc member and resistor neither of which are shown and connective members 440 and 442 the led 420 protrudes from the top of the protective member 410 the protective member 410 comprises insulating material such as rubber or molded plastic and serves to protect a user from contact with electrical hazard when the tool 400 is installed and to protect the device 400 from electrical and mechanical hazard fig5 is a simplified illustration of a hvac electrical circuit 500 depicting a short locating tool 510 of the present invention connected across the terminals of an overcurrent protection receptacle 515 the hvac electrical circuit 500 illustratively comprises a 40 volt amp transformer 520 having a 24 volt secondary voltage a standard hvac terminal bus 525 having terminal connections for power r common ground c the fan circuit g the heating circuit w and the compressor circuit y a thermostat 550 an overcurrent protection receptacle 515 illustratively comprising a fuse holder and or a fuse and a hvac control board 530 the hvac control board 530 comprises a plurality of branch circuits 532 534 and 536 by way of illustration the first branch circuit 532 may comprise a fan control circuit the.