Another item to test if you are having electrical problems is the relay for that component. Relays are used in high power devices and are essentially electrically activated switches. When you turn your car on, multiple components turn on like the fuel pump, computer and electric fans. A small amount of power is run through the switch in your ignition which can then activate multiple relays turning all the peripheral equipment without running full power for all of them through the ignition switch. Relays also can go bad over time and cause electrical problems. The best way to test a relay is to have a helper touch or listen to the relay while you turn the device on. You should feel a slight tap and hear a quiet click as the relay engages.
Take the proper safety measures prior to dealing with your car's electrical system. Disconnect the car fuse box from the battery and be careful with any sharp edges as you can get easily injured. Use a flashlight if necessary.
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