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I suggest you start your own thread to deal with your specific problem.

Do this first. Take the wire(s) off alternator #2's negative terminal and tape them up. Run a test wire from alternator #2's negative terminal to the negative post on the rear battery. Verify the large wire connected to the positive terminal on alternator #2 goes to the rear battery positive...

I think I may see your problem. The ground terminal on alternator #2 does not connect to the chassis ground, only to the negative battery post of the rear battery. Since the positive post on the front battery and the negative post on the rear battery are connected (the front and rear batteries...

If this is an isolated ground alternator and there is no connection to the isolated ground terminal (I don't see one in the picture), the alternator will not work. If you were to connect the positive post from the front battery directly to this terminal and it's isolated from ground, it cannot...

Why don't you take a picture of what you have now so maybe we can help you?

The alternator in the pictures is not isolated ground. The circle in the picture is the ground on an isolated ground alternator.

Is alternator #2 isolated ground?