Yes this has been asked before and the answer I always give is that multimeters are incapable of measuring the low values of resistance of a coil. In fact they are probably not accurate enough to measure a complete winding except perhaps for a 48v machine.
Unless you have a Kelvin Bridge or special 4 contact Low range milliohmmeter designed for this the only satisfactory way is to use the volt drop method.
Connect the coil in series with a low resistance and a 12v battery. Choose the resistance to give a few amps ( 2 to 5 ohms is fairly convenient). Measure the current on the amps range of your meter or if you know the exact resistance of the resistor you can calculate current from the volt drop across it. Having found the current you can now remove the ammeter and use your meter to measure the volt drop across the coil.
From the current flowing and the volt drop you calculate the coil resistance from Ohm's Law.
You should measure the volt drop in such a way that you don't include the connection resistance to the coil. If you bare the ends of the coil and tightly twist connecting wires to them about 1/2" from the end for the current you can measure the drop at the ends of the coil connections and it will be free of any connection resistance to the current leads.
I hope you can follow this without a diagram. This has probably been written up by someone and with a bit of luck there may be a drawing somewhere. It is an important issue and something that ought to be in the FAQ section.
Flux
