there is no "power" to the button, there should be a wire that's part of the upper mast bearing [invisible unless you take the bearing out] that runs down the mast and when you press the button the contact plate and the plunger/contact brush causes a ground to be applied to that wire .... the wire from the bearing should come out of the mast just below the dash

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics