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If you are pissing around with your electrical change the whole works over. If it is as old as it sounds it is probably knob & tube. The old wiring gets brittle and if you try to connect to it it tends to break. It does not always break where you are working either. You don't want to pull short ground to your plumbing. If you get a short to ground on the system you hot up your plumbing. If you were between the short and the place where the plumbing leaves the house you could get zapped. While you are at it replace your grounding. Old galvanized pipes make for a shitty ground after a long time.
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