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I am trying to wire an in wall timer and am confused about the neutral wire. It's a single pole switch on a multi circuit in a multi gang box. The timer wants me to connect a neutral wire, but when I undo the neutral bundle and connect the one I think is for the light I want on the timer, it doesn't work (the light won't turn on). What am I doing wrong?!

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    Can you post photos of the inside of the box, and the make and model of your timer? – ThreePhaseEel Aug 6 '17 at 15:52
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    Single pole switches don't necessarily have neutrals present in the box. They also make mechanical timer switches that don't need neutral, the human powers them with her strength. – Harper - Reinstate Monica Aug 6 '17 at 17:17
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Don't seperate

All neutrals stay in the bundle. Add the neutral from the switch to that bundle.

Your wording suggests you are removing the neutral coming from the light and making a one on one connection to the timers neutral. Instead you need to add the timers neutral to that bundle, leaving all neutrals connected together in the bundle.

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