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I've been thinking of adding some white led strips in the footwells but I want them to work with the map lights how they turn on when you open the door and then fade out when you close/lock the doors. Would I need to tap the the positive wire directly from the map light or can I tap the fuse in the fuse box? I much rather tap it the fuse box because I can use the add-a-fuse.
 

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the map lights are wired directly to the Body Control Module (BCM).

you would need to tap the wires at the map light, and to get it to work like you described you would need to find the green wire and tap into that one.

see attached link for the map light diagram

"http://am.mazdaserviceinfo.com/emazda/dealersystem/service/esi/en_us/SM/2012/Mazda3/k3/books/k3d09/html/0918_8.html"

to get this to work properly go to "Tools" then "Compatibility View Settings" then "Add" and close

on the link you can see the flow for each option.

I hope this helps
 

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