Loader performs a voltage drop test with the push of a button. On a 48 volt system, pressing the switch applies a load of approximately 1 Amp across the circuit. This simple test finds problems in corroded wires, loose connections, bad grounds, cut wires, shorts to ground and other forms of resistance. Start doing voltage drops now! Diagnose faster and earn more. Works with your existing DMM, just plug in our test leads and improve your diagnostic capabilities.