In step #3 of the six-step troubleshooting plan, you analyzed all the symptoms that were confirmed through your preliminary checks. Based upon these symptoms, you could make a conclusion as to the type of electrical problem that the circuit has : - An open circuit, An unwanted parasitic load or short-to-ground, A high resistance problem, A feedback from another circuit, In this section, we will concentrate on diagnostic strategies and techniques that should be used to isolate each problems. You’ll find that using the “right” tool for each type of problem will save you a lot of time when working to pinpoint location of the circuit problem. Diagnosing open circuit problems : Disconnected connectors, Bad switches, poor terminal contacts, cut wires, blown or defective fuses. Using a voltmeter on open circuit problems, an open circuit voltage (positive probe at terminal, negative connected to a known good ground) will verify continuity in the circuit to the B+ Source. Use the EWD to determine where to make the checks and if any switches/relays need to be closed. Connect the negative probe of the voltmeter to ground, and use the positive probe to check the various pin voltages with the circuit on. Using an Ohmmeter on open circuit problems. Diagnosing Parasitic load problems. Determining the location.
Tags : using a voltmeter, problem diagnosis, negative probe, diagnostic strategies, open circuit voltage, ohmmeter, ewd, electrical problem, six step, electrical system, fuses, step 3, continuity, switches, resistance
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