How Do I Troubleshoot Auto Electrical Systems?
Troubleshooting auto electrical problems can be frustrating. Remember that each device needs a certain amount of voltage to function and that each circuit needs a power source.
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Battery
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Disconnect your car's battery before attempting any electrical troubleshooting, as this will limit the risk of accidental shock. To avoid your car's computer forgetting its "learned" settings, use a 9 volt memory saver. This device plugs into your car's cigarette lighter.
Circuit Check
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Use a voltmeter to test for voltage to all devices in your car such as headlights, windshield wipers and blower motor. Check the circuit breaker, fuse or fuse link for any non-functioning circuits, as this may be the source of your problem.
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Ground Connection
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Voltage is useless if a circuit does not have a complete ground path to the battery according. An ohmmeter can determine whether or not a circuit has this path. Never use an ohmmeter on a live circuit.
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