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To track down and troubleshoot electrical issues, you will almost certainly need a multimeter (also known as a Volt-Ohm meter) - digital ones are best, like the one illustrated below (from Wikipedia) You can get cheap ones, which are fine for most automotive stuff, or much more expensive ones with all sorts of clever features. The two most useful things ...


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Tools Digital Multimiter Voltage, Resistance, continuity settings Automotive specific DMM's are typically the same device but may have a few extra features (Duty Cycle, RPM) CAUTION: Certain modes on the multimeter can cause damage to the device or your car if improperly hooked up. Never connect the DMM to a circuit in parallel when it is on the ampere ...


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I'd like to add to Nick's answer and mention a Circuit Tester if you need to simply test the circuit for power.



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