Two indicators on each side, one at the front and one at the rear, are stipulated for trucks and buses. When used, these must illuminate with a frequency of 1.5 Hz (± 0.5 Hz) = 90 x per minute (± 30 x) on both sides simultaneously. The indicators are operated with a steering column switch on the steering column.
The glow plug is an electrically heatable heating element and protrudes into the cylinder. Since the fuel injected into the combustion chamber ignites poorly when the diesel engine is started cold, glow plugs are used to ensure that diesel engines start reliably at low temperatures.
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