If the starter does not rotate, you should first check for a voltage of at least 8 V on terminal 50 of the traction relay. If the voltage is below this value, you should check the wires related to the starter circuit according to the electrical diagram. Whether the starter operates at full battery voltage can be checked as follows.
Test condition: Wire connections must be well secured and not oxidized.
Set the box to neutral, turn on the ignition. Then, using an auxiliary wire with a cross section of at least 4 mm2, bridge terminals 30 and 50 of the starter, see also wiring diagram.
If at the same time the starter works normally, then the reason lies in the wiring. If the starter does not work, it should be removed and checked.
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