my generator trips one pole /30 amp generator breaker even when the transfer switches are off
You said:


  I disconnect the red, black, and the neutral from the generator to the house neutral and the transfer switch leads and I read 120 volts from the black feed to the generator neutral and 120 volts from the red feed to the generator neutral and 240 volts between the red and black generator leads as would be expected but when I measure the black generator lead to the house neutral I get 0 volts and from the red generator lead to the house neutral I get 240 volts and the red generator lead is the same one popping the 30 amp generator circuit


If the black generator lead to the house neutral is 0 volts then someone has connected them together somewhere. That is why the red lead to the house neutral is 240 volts.

It sounds like something is seriously mis-wired here. Take apart what you have and post some pictures or better yet trace every wire and draw a diagram of what you have and post that with the pictures.