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I have no idea what motor you are working on.----Please do tell.-----Posting more pictures might help YOU as well.
Ayuh,..... Donno what that is with the single wire on it,......
The slave solenoid is the other thingy with the other red cables attached to it,.....
Pardon my ignorance but what is a "slave solenoid"
Also, the other thingy that has both red wires tagged to one side has a reset button on the back and appears to be a thermal or overcurrent protection. The LM318s in my Silverton had one each sticking out of the plastic cover for the ignition electrics on the engine.
Ayuh,..... If the thingy with the wires on one post, has a reset button on it, it's a circuit breaker,......
Boats use a slave solenoid to excite the starter's solenoid, rather than straight from the key switch, so that the starter's solenoid gets full battery voltage, 'n not the voltage loss runnin' power twice the length of the boat on little tiny wires, to, 'n from the key switch,.....