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Two ways to check glow plugs
1. Put your fingeer on the top of the plug where the wire attaches, It should be very warm to hot. Do not activate plugs removed from the block you may burn them out.
2. Check with your engine mfr for Ohms resistance and measure the cold plugs to determine whether or not they are within spec. Hot plugs will create show greater resistance. If you measre current draw by the plugs you will at least know if some of them are working. On new engines or with new plugs I log the current draw of the activated plugs, If it drops you know one or more has failed and you can determine which one by checking its cold resistance with an Ohm meter.
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