Whether glow plugs are supplied with voltage at all is checked as follows.
Connect test lamp between ground and voltage cable (red-white) on the glow plug
Remove the plug from the coolant temperature sensor and hang it freely in the air.
Turn the ignition key briefly to the pre-glow position. The lamp should light up. Therefore, the circuit for supplying voltage to the candle is working.
If the control lamp does not light, then the fuse tape (as mentioned), glow plug relay (engine power 47 kW) automatic glow time control device or glow plug relay (motor power 55 kW), the ignition switch or the supply cable may be defective.
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