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Map Light Rearview Mirror - Dome Light wirequestion

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Finally back to working on the stang again, and am installing an SN95 mustang rearview mirror with map lights. The mirror map lights need a dome light feed so that they turn on when the door is opened. It also needs to be 12v, and from my understanding, these car's courtesy lights run on a reverse ground system.  Connecting the floor courtesy light wires to the mirror dome light wire makes my courtesy lights on even when the doors are closed.....which I believe the ground is feeding back into the courtesy light from the rearview mirror. 


How have you handled this wire on an map lighted rearview mirror install? Much appreciated!

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5 hours ago, mustangstofear said:

I would say it's  the same way we wire up our overhead  console lights.  We make a  special harness just for this application.  We designed ours for  the  lights to come on when the doors are open, Ford had you using the  switch to  come  on.

Which factory wire do you tap into for your overhead harness?

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