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ryanuni 12-16-2009 08:55 AM

Need new light in garage
I would like to install a new light fixture on the same string as an already switched light. When I tapped into the middle of that 2 wire romex with a junction box and hung my fixture the fixture didnt work and worse yet the existing light further down stream stayed on regardless of switch position.
service comes to the existing light first... then to the switch at the END of the circuit, at the light the hot changes from black to white and then goes past my intended new light then on to the switch.
How can I get them both on the same switch?

secutanudu 12-16-2009 09:18 AM

Can you give a better description of what the wiring looked like in each box (switch and fixture) before you changed anything?

It sounds to me like you have:

In the fixture box:
House power romex (black and white) coming in
Romex (Black and white) going to the switch box
Two blacks are tied together
White from house power romex is tied to fixture's white
The white going to the switch is hooked to the fixture's black (this wire should be re-marked as black with tape)

In the switch box, black and white are tied to the switch. (this white should be re-marked black as well).

Is that right?

HouseHelper 12-16-2009 09:42 AM

You tapped into the switch leg... that won't work (as you have noticed) because there is no neutral.... the switch leg contains only a constant hot (remarked white) and a switched hot (black). To add another light, you will have to run new **/2 cable from the existing light to the new light.

ryanuni 12-16-2009 10:16 AM

It sounds like you both have a proper grasp of the situation, and confirmed what I feared... more work

If I run new 12/2 from the existing light to my new switch will it also be switched with the existing switch? If so what do I connect my new romex to to make this happen? (secutanudu's description of the situation is correct)
Thanks for the help!

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