> outlets and had lights to half the house.  Tried another outlet and had
> lights to the other half of the house.  Wonder why it only would do 
> half?

Because the typical US home is fed with 240V, center-tapped
off the supply transformer.

That gives you two 120V halves of the house.  You happened
to use one outlet on each (electrical) side.  Adjacent breakers
in the fuse panel tap alternate halves.  That's why 240V
breakers are double-high, they pick up both halves together.
That's why back-feeding one of the 240V outlets gets it all.

-- Jim


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