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check you have power at the glow plugs . fit test light clamp to ground and probe the glow plug rail if no power check fuse if fuse is good check relay if relay is good take vehicle to your mosy trusted garage
the glo-plugs are normally relay controlled , so check for fuse and faulty relay
remove the wire to the glo-plug and using a multi meter set to voltage check for voltage in that wire
Check the relay for the glo plugs as it is not supplying power to the glo-plugs. Check that there is power getting to the relay. Check if a fuse is blown
trace the wire back from the glo-plugs and you will come to the relay. Remove the glo-plugs and using short jump leads test across the battery terminals . Place one lead on the wire terminal and the body of the glo-plug on the negative terminal. If good it will heat up immediately . If burnt you will see it.
The heating plug light is indicating current flowing to the Glo-plugs and if flashing indicates a ready to use situation or a relay fault. I would have it check out ASAP as it may burn out the GLo-plugs if it is on all the time.
It is normally checked with an amp meter with at least a 10A range. You need to know what the correct reading is for that type plug. For instance, NGK:
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