The solenoid Max was referring to is a relay, solenoid is an American term for starter relay. They go between the battery and the starting motor. The link he posted even states that, and shows a picture of it. Did you even look?It is an old project so I have to choose relay.
Diesel engines, the larger ones anyway, require pretty high starter current.It is for diesel generator starter,unfortunately I don't know so much detail.
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