Wiring Disaster

I recently overloaded my system. Afterwards, the generator would power on but my outlets, roof AC, and microwave had stop working. I took my RV to a “specialist” and it was a big mistake. I quickly realized that this mechanic didn’t know what he was doing. Since the generator was running, but not providing power he said he had to change the 12v 120 White-Rogers solenoid, and a 40 amp circuit breaker. While I was waiting I heard him scream. He stumbled out the RV and said he shocked himself. I asked him if he disconnected both batteries and he said no, only the house battery. He then said I didn’t have to pay him and he didn’t feel comfortable touching the RV again because he was badly shocked. When I got back into the RV I noticed wires incorrectly hooked up and my generator would not start. From a picture that I had took months earlier, I was able to figure out where some of the wires went, but there are three wires I am unsure about. I have tried a few combinations but I have not had much luck getting the generator to start. The generator lights up but now it trips the breakers every time I try to start it. Everything else works in the house part. I have not been able to find any house battery wiring diagrams that explain what goes into each circuit breaker.