Testing switches w/ digital ammeter

["Sean Clark" <sjclar00@hotmail.com>]

Hey,
    I've been trying to diagnose my ignitions switch using a digital 
multimeter.  I'm not real sure how to use it, as I borrowed it from a 
friend.  If I'm testing for continuity across terminals, what result 
indicates a faulty switch.  When I use the audible ohmeter mode of the 
multimeter, it beeps and registers a changing resistance that varies from 0 
to 300 to 600 ohms.  It jumps around in that range with no particular 
pattern over a period of a few seconds.  Does this indicate a faulty switch? 
  I know that a good switch should show no resistance, but my weird results 
have me unsure on whether or not the switch needs replacing.  What's the 
deal?

Thanks,

-Sean Clark
88 16v Scirocco

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