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Diagnose Electrical Accessories It is easy to diagnose electrical accessories If you can read wiring diagrams Quiz #20 • Blower Motor works on HIGH only • What might cause this? Warning Systems • Most systems will ground a buzzer or warning lamp Gauges • Explore the operation of a bimetallic dash gauge Bimetallic Gauges • As voltage increases what happens to amp flow? • Many dash gauges use an Instrument Voltage Regulator (IVR) to keep a constant 5 volts to the gauges Diagnose dash gauges • Notice if all gauges are out or only one • Use a test light to ground the sending unit wire • Do not use this technique with digital dash Two Coil Magnetic Gauges Three Coil Magnetic Gauges Diagnosing Gauges • Some gauges can be damaged by grounding sending unit wire • Digital Dash gauges may send 5 volt reference to sender • Use diagnostic charts to diagnose digital gauges Instrument Clusters • Use caution when handling printed circuit boards • Finger prints can cause high resistance and eventual open circuits in printed circuits