you'll need a dpdt switch. you can get one at radio shack.
the switch will have 6 prongs like this
**
**
**
where the middle one is the power in and the 2 outside ones are power out
hook up the switch like this
lets say you have 2 wires for the foling of the mirrors one red one black
<span style='color:red'>*</span>*
+-
*<span style='color:red'>*</span>
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