You need to find out if you are really not generating anything or not. From what you just described of your generator, you can't trust the outlet for the source of your test. The little breaker could be bad, the outlet might not even be wired up or a whole host of other issues could be involved here.
The best thing to do is CAREFULLY measure the voltage off of some of the leads going to the main breaker where they exit the reconnection switch. Or if you can follow them, from the leads coming into the box from the generator head itself. If you have nothing there, follow the procedure in the TM and remove the field wires going to the head and place 12 volts from a battery across the field leads. This will isolate the problem to either the head or the machine itself.
There ya go! In the electronics world we call this, "circuit splitting". The idea is to find a place in the circuit where it DOES work, and a place where it doesn't work. Now you know the problem is somewhere in between. So, pick a point in the circuit halfway (roughly) between the two. If it works there, find a point halfway to the failure point. Check there. If it doesn't work there, go back.
By finding a working point, and a non-working point, then going halfway in between each time, you get to where the fault is in minimum time.
It's the same idea as calling in artillery fire. You want to bracket the problem with as few rounds as possible.
Get the idea?
In your case, you know where it doesn't work, so go as far back as you can easily go and test. If it's no good there, you have to go farther back.
At some point, you've gone as far as you can, and you now know where the problem is.