More resistance (ohms) means less continuity. If your meter is set to test ohms, when the number reaches infinity, you are no longer connected (ie: the circuit has been opened, wire disconnected, switch turned to off, etc.). When the meter reads zero, you have perfect continuity (ie: closed loop circuit, the connection between your meter probes are electrically connected). Since it's not a perfect world, when checking for a break in a circuit, you would expect a reading very slightly above zero for a closed or complete circuit. A break would be indicated by very high numbers or, depending on your meter, an infinity symbol.
When I checked my headlight circuit, I set my meter to 0-25 volts DC, started my bike (to kick on the relay) and put my meter's negative lead to the headlight ground, and the positive lead to either the high or low beam circuits. A reading around 12-13 v there indicates the circuit is complete and I am getting juice. If you have a good working bulb, though, this test is pointless. You might as well have the bulb plugged in and you will know if you have juice when the bulb lights up.
When I checked my headlight circuit, I set my meter to 0-25 volts DC, started my bike (to kick on the relay) and put my meter's negative lead to the headlight ground, and the positive lead to either the high or low beam circuits. A reading around 12-13 v there indicates the circuit is complete and I am getting juice. If you have a good working bulb, though, this test is pointless. You might as well have the bulb plugged in and you will know if you have juice when the bulb lights up.