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+12V in the trunk?

27 November 2005
SoCal ✈ Vegas
I am looking for switched +12V in the trunk, does anyone know if there is a pre-existing source (cd changer, antenna, etc.), or will I need to run a power wire back there, from the ECU location?

This is for a reverse camera, but I don't want to wire it to the reverse lights.
How about the 4-pin phone harness connector? I don't know if all cars have the prewire, but there's hot, switched, and a ground on that connector in the left front corner of the trunk.
yep, the one on antenna harness powers-on with the switch. if i recall there are 2 positives, one stays on with a key, one is a pulse.