Dave, that's what I thought, that the up position of the switch I got corresponds to the upper contacts. However, it is the exact opposite. When the switch is up the lowest contacts are ON.
I had to rewire mine because I just assumed the signal would go the direction the switch pointed. I like the switch moving horizontally so so it points to the amp I want to use.
Another nice thing about using this switch is you can avoid any amp power up noise by selecting the amp last.
Jess
Inspired by this thread (because I was also having the problem of having one pair of speakers and two amps) I decided to make an amp-switch-box.
The switch is a sturdy looking switch from ALCO with an off position:
http://nl.mouser.com/ProductDetail/TE-Connectivity/A4TP15W04/?qs=%2fha2pyFadugHEG%2f%252b4xonx%2fAKU5HZw%252bS5JJ5sbaWD1yU%3d
Used 12 long binding posts and a generic aluminum casing.
The back looks a bit crowded and its a tight fit for the binding posts.
Its working really well.
It did take up a lot of solder though
The final thing left to be done is to make some sort of identification on the switch.