On/off switch for rearview camera

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the best advice I can gicve is to run it through a relay where either source would close the coil to energize the cam. since it would be using 2 seperate 12v sources 1) the rear tail light, 2) the switch you control. the other thing I can think of is 3 way switching as in a house where you can turn on and off from 2 or more locations.

 
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