Sean Clark, from mp3Car, shows us an overview of how each component will be powered in the vehicle. He outlines the importance of in-line fuses for each positive cable. Power distribution blocks will be used to give each individual component power and ground. Grounding all the components in one place is important to avoid noise being introduced into the system. If you are able to ground directly to the negative terminal on the battery, this will help alleviate noise as well. Monitor power is provided by the M2-ATX power supply in the computer. "Filtered" 12V power is required for most monitors as they aren't set up to the handle voltage fluctuations most automotive power systems supply. In this case, the Lilliput 669 needs filtered power. Accessory wires are run to each component and provide switched 12V power to tell each component to turn on with the ignition status of the vehicle.
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Car Computer Install: Power Structure