No you did the cabling correctly.
It's "always on" so that the compass memory does not get reset everytime you turn off your ignition/accessory power source; also useful for keeping your home-link memory settings as well
The mirror will not kill your battery. It takes very very little power.
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2009 PG 6MT Sports Stillen Gen3 CAI | Stillen CBE | AMS Short Shifter | Nismo Brace Kit
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