3. Operability of candles of an incandescence can be checked, giving on them 12 volts. At the same time they have to heat up evenly and for the required time interval. At the same time it is necessary to observe precautions: • To hold a glow plug специаль a ny clip or flat-nose pliers.
• The electric power-supply circuit of a glow plug has to have the fuse.
• After check the glow plug has to be cooled within several minutes.
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