ELECTRICAL SYSTEMS DIAGNOSTICS Power Probe t rela Thes wh Tt 12 | ELECTRICAL TESTING SUPPLEMENT | DECEMBER 2016 Lisle Corporation Circuit testers There are as many uses for circuit testers as there are different types of them. Circuit testers range from standard test lights to state-of-the-art units that can read digital values of volts, ohms or amps. Many testers have the ability to supply power or ground in order to test components. Specialty electrical system test tools There are many specialty test products that can be used to test specifi c components. These include relay testers that replace a relay in a circuit and include a switch to provide power to the controlled circuit. This tester can be used to determine if a relay is faulty, if the circuit is faulty or to control a circuit for additional testing. Other relay testers allow test terminal access while the relay is in the circuit. These testers provide the ability to check power, ground and control, when combined with a circuit tester that provides power or ground. There are some self-contained relay testers that provide the ability to check control and function without the need of a circuit tester. There are numerous ways to test amperage in a circuit, but in many cases it is necessary to tap into the circuit with an amperage tester wired in series. The latest versions of amp testers allow the ability to obtain amp readings by accessing the fuse. Having the ability to test the actual amperage in a component is invaluable in determining if the circuit is functioning properly. For instance, knowing the amperage a fuel pump is using to operate at a specifi c pressure and comparing it to a known value is a great way to determine faults within the system. If the pressure is correct, but the amperage is higher than normal, that could indicate a faulty pump, high resistance in the circuit or a restriction in the fuel system. Enter 5 at “e-inquiry” on VehicleServicePros.com
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