Testing Glow Plugs
I used to work on VW and Audis. The best way to test the glow plugs is to get hold of an Amp Clamp (clamp on ammeter) and locate the wire leading to the brass bus bar that all the glow plugs are bolted to and clamp it round that wire switch on the ignition (When the engine is cold) and the meter should read 12A per plug (4cyl engine = 48A, 5 Cyl = 60A, 6Cyl are usually split into 2 groups of 3 = 36A each wire) any less and you have one or more dead or failing plugs
Then it's down to taking them out and testing them indivdually
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