To check the starter with battery voltage, you need to connect terminals 30 (large terminal) and 50 (small wire next to large terminal) using a wire with a cross section of at least 4 mm. If now the starter is working properly, then check the wires suitable for it. If the starter does not turn on, it must be removed and checked.
Accurate testing of the starter on a test bench is only possible in a workshop environment.
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