Should be a recessed male spade terminal in your factory fuse block, it's marked "accesory". Use it, but be sure & use a fuse or fusible link of sufficient amperage to protect the circuit.
This circuit should be an ignition hot circuit, which means it's hot when the ignition is on.
SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY!
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SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY!