To draw off as little current as possible when the starter button is operated
After starting the engine
How it works
The solenoid is generally mounted immediately above the starter. When the starter switch is switched on, the pull-in windings (on the left) and the hold-in windings (on the right) receive current through the terminal '50' and move, through magnetic induction, an iron core in the axial direction. Through a lever, the small pinion of the starter is pulled towards the fly-wheel. If the gearwheel connection takes place, the high starter current is switched on through a large cross section at the rear side. At the same time, the pull-in windings (on the left) are short-circuited through the starter current and switched off, thus causing a lower strain on the energy supply.
If one hears a clicking sound when turning on the starter current, this is, even if the starter does not turn, a sign of an intact solenoid. Then at most, the problem can be a smouldering when turning on the starter current, or any other defect of the large cross section at the end. A somewhat rarer case is, if the starter repeatedly meshes in and then out again. This then probably means that the hold-in winding is damaged. 12/09
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