￼￼ OK in the image the B terminal is on the right correct? M is to the left supplied with constant voltage from the battery correct? When pressing the starter switch M terminal closes the contacts by the coil inside the solenoid and transfers it to B terminal which in turn spins the starter motor and cranks your engine over. Except nothing is happening when am pressing the starter switch no power is supplied to the B terminal. U might notice the yellow and red wire to the back of the solenoid it's this wire you have mentioned when pressing the starter switch should supply voltage when pressed. The other wire a black and white wire running from the starter switch also runs into the back of the solenoid its this that's supplied with constant voltage.Test light . 1 large positive ... , push button pushed ,. Light on small wire ., And it then energizes the other large post ..... going to starter ....
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