[encantotom]

not doubting your technical prowess, but in wall vacuums usually only have a low voltage wire to the wall plate where the hose plugs in. the relay is in the vacuum unit itself. that is why it uses usually a 22 or 24 gauge wire to the wall plate. i have installed several of them and i know at least the newer rv built in vacuums are the same.

are you sure it is 120v there at the wall plate?

tom