twistedpair,
May I suggest you install a relay…which would allow you draw power direct from battery. The relay needs to be wired to activate on /off with the ignition, thus allows DVD monitor headrest to draw it power directly from the battery.
Any good stereo shop can perform this for you.
One note… The GM wiring system is not diagramed or gauged to handle the draw of power that a DVD headrest monitors require. Please do not draw direct power source off the ignition either, it will lead to other complications. You should only draw to switch-able relays and draw direct power off the battery.
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