Joe, the magnet resistance should be between 2.5 and 3 ohms per magnet. The voltage at the axles should be between 9 and 10.5 volts. The current used at each axle should be between 5.6 and 6.6 amps.
All these numbers are dependant on wire resistance,corrosion, dirt, shorts,opens,if you are connected to the tow vehicle, if the motor is running.
If you are reading 3.3 ohms, you may be reading only one magnet (and it"s associated wiring), suggesting that the rest are not connected.
I would get a friend to help me try the compass test first to find out which magnets are being actuated, then voltage tests, current tests, and finally resistance.
