Yellow pages, call an electrician.

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oups.com...
I'm try to change the swicht from my medice cabinet (bathroom)
2 wires ( from wall, white en black )my ficture has 4 lights
but ends with 2 wires white en black...but to small to reach to the
end of the medice cabinet, so I add wires to..y put together 3 white
wires, ( wall, cabinet,swicht ) then as soon i touch black wires power
goes out...need help