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if you have the switch on the IGN line, you never kill the power to your powersupply, (this power is always supplied through the 12V line (you have 3 line to the PSU: 12V, ground & IGN) IGN controls the behaviour (startup/shutdown) of the computer. If you want to totally cut the power , you will need a switch on the line between your battery & the PSU.
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Final Touches
Car: 2002 Mitsubishi Magna EI
CarPC: SP13000, M2-ATX, 512 MB RAM, 120 GB 2.5" HD, X-Fi Sound Card, Xenarc 700TSV, Garmin 18 USB.
Audio: 2X15" Rockford Punch Z, 1 Rockford Punch 2-ch Amp, 1 Soundstream Lil Wonder II 4-ch Amp
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