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That will work fine. Put it before or after the resistor. You're not really getting ground. When you disconnect the source, the other circuits in your car that are on accessory are putting a heavy load on the cap, so it instantly drains. The diode prevents the current from reversing.
Actually, I don't think you need the resistor.
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XPort 1.26 -GPS port splitter, logger, and USB device resume fix
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