Try again.
Put the switch in the middle position (normally off) and check for continuity between all pairs of terminals (1 - 2, 2 - 3, and 1 - 3). If that's truly off, you should have no continuity at all. (maybe between coil and accessory).
Then try the 11 o'clock (assuming that's the "standard" accessory position), and do the same. In that your should have continuity between only one pair of terminals. One of those will be battery and the other accessory.
Then in the 1 o'clock ("standard" run position) check again. You should have continuity between all three contacts, battery, coil and accessory.
You might want to hook it up on the bench and try every combination of wiring. You should be able to determine where they go.
Or do the tests above and make a table of which are connected in each key position and post it up here. Someone should be able to figure it out for you.
