Help installing Leviton programmable timer in old house
One of those 2 black wires is the feed, the other one is the load, which goes to the light.
Connect the black lead from your timer to the feed.
Connect the blue lead to the load.
Connect the white wire to the other white wires in the wirenut that is tucked in the box.
Connect the green wire to the bare wire.
If the timer fails to work properly, then reverse the black and blue leads.
Life is uncertain -- eat dessert first!!
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