Transfer switches and generator power

The transfer switch picks between shore and generator. When it fails, the coach may have power on one source and not the other.

The short version

• Check voltage coming in from each source at the transfer switch.
• Most switches have a delay for the generator. Wait for it before calling it bad.
• Burned or loose contacts are common. Look for heat damage.
• If shore works but generator doesn't, check the generator's output and breaker first.

Try it on a service call

Put the lesson to work on a hands-on troubleshooting case.

• Generator runs but coach has no power

Keep going on 120V and shore power

Learn it

• Shore power: 30A vs 50A
• Breakers, GFCIs and the EMS
• The lost neutral (50A danger)

Prove it

• Half the coach is dead
• Bathroom outlets are dead
• Lights surge and the microwave died
• Shocked at the door handle

On the job

• 120V system
• 50A power problems