Originally Posted by speedy petey
This is not at all true. I'm sure you meant this a different way.
Did you mean "no neutral wires on a switch"?
Also, "ground" is NOT synonymous with "neutral".
There may not be a ground or
a neutral wire in that particular box because the original post said it was an older home with older wiring.
No, ground is not synonymous with neutral. But again, neither ground nor neutral may be present in this particular box. I was merely stating that an older home with a switch leg dropped down to a switch box may not have a ground or a neutral. It may only have 2 wires, one hot, one return.. Or, in the case of a 3-way switch, it may have 3 wires, one hot (or return) and two travelers. If there is not a bare copper or a green wire in any box in any particular home, I assume that that house was built before code enforced grounding started.
anyway, back to the problem in the original post.
You said you have 3 wires on one switch in the dining room?
It sounds to me like there was a hot wire, spliced to another wire in that box to feed the kitchen light circuit, maybe both were connected together on the same screw on the dining room light switch, with a lonely wire from the other side of the switch going to the light in the dining room. If the wire that provides power to the kitchen lights is now spliced to the wrong side of that switch, then the kitchen lights will only come on when the dining room light switch is on.
The solution to your problem may be as simple as moving one wire from where it is to another position on the switch.