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Maybe I'm reading this wrong, but it seems as if you're asking if anyone else on here has connected their power supply to their car?
The wire that is used to power your radio is probably not going to be thick enough to handle the current that your carPC will pull.
It is always recomended to run a dedicated power wire directly from your battery (do NOT splice a larger wire onto the harness) and run the equivilant gauge for the ground wire. the ignition can and should be pulled from the radio harness.
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