[Vwdiesel] Testing glow plugs

[LBaird119 at aol.com]

  I simply use a test light.  Clip to battery pos, touch the probe end 
to the glow plug end.  If it lights, the plug is good.  You can check 
all 4 in about the time it takes to get a solid reading on an ohmmeter.
:-)
  You can get goofy plugs once in a while, where it glows on one 
side, part way up only, etc but that takes a visual and I do that 
after testing for continuity with the light, if there's a starting issue.
Haven't seen one of those funky ones for 20years though.
   Loren