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No, your DMM should have a special 'diode check' mode, with mine it is a 'sub'mode of the ohms measurement, a little diode symbol appears in the display, and its readout is in volts.
When you measure resistance, anything close to 0 ohms is good. As far as I know, the requirement for a house's ground wiring is that the resistance to ground should be less than 2.5 ohms. OL means that there is no connection, and indicates a problem. Do make sure you make good contact, little layers of oxidation on metal often make it seem that you have no connection. Carefully poke the sharp point of the DMM lead into the metal, then you should be OK.
(Edit: about 4 spelling errors, and: to at least try to avoid the 'false ground' problem that Easy mentions below, try to unplug as many connectors as possible, and connect only those needed to complete the path to the negative battery pole. Do start with the green wire from the side stand relay pin C (unplug first)) Good luck.
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2005 "Saturn Black", stock + tach
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