You said you had a Tri-axle rig.. so that would be six magnets. If you are measuring the actual ohms of the magnets when all together, which it should be just as you describe it, you should see less than one ohm I would think.
Perhaps you are only applying voltage to one axle instead of all three? With some long jumper wires and a lot of fiddling, you should be able to determine if you have continuity in both the positive feed, and the return feed from each wheel back to the connection plug. Finding the common feed and possibly the disconnection point will be difficult.
