A few glow plugs operate on 4-5 volts on modern motors which is why a 12v feed shouldn`t be used to test them as they can be burned out,an ohmmeter would be the best bet to test them and if there is zero resistance there then I would say that plug should be renewed.
cdc
August 2013
They are earthed through the body into the cylinder head,no wires.
cdc
August 2013
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