no generator power to RV/ tranfer switch?

[hsbill]

I have an RV with a PowerMax PTMS-50 Automatic Transfer switch. The RV electrical system works fine when connected to shore power. However, when running the generator the RV has no power. I checked the power running to the transfer switch from the generator with a volt meter and it was 120, but I couldn't get a reading for power coming out of the switch to the motorhome. The transfer switch would just make a "buzzing noise".
I replaced the transfer switch with the same make/model and I have the same problem. Generator runs, appears to supply power to the transfer switch, the transfer switch buzzes, but no power in the motorhome.
Thoughts?

[Old-Biscuit]

Generator wiring in ATS......
Are the L1 and L2 terminals 'jumper used'

Are you measuring BOTH L1 & L2 voltage?

Generator only a 30A vs 50A?


2 yr warranty!

Have had bad ATS right out of box----reason I do not have a ATS---mine is MANUAL

[Kiawah]

I'm assuming you have disconnected shorepower when you are doing this test. And for the sake of this test you should turn off high current demand devices (like A/C's, hotwater heater, converter, etc).

I speculate that your generator has a problem, and although is showing 120vac, that's under a no-load situation. Could be when a load is put on it, the voltage drops.

I normally would have thought your transfer switch was bad, but you swapped that and still have the same symptom.

So given this situation, what I would do to prove the problem, is to unhook the generator from the switch, and wire in a 20amp cable that I would build to plug into home garage socket. [Make sure you get polarities correct (black power, white neutral, green/bare ground}]
- If you still have the same problem, then you've proved the 2nd transfer switch is also bad, and I would choose a different mfgs switch.
- If the switch works, then that proves the problem is with your generator, and you begin trouble shooting that.

Good luck

[SuperGewl]

More information about MH and generator would be nice also.
Go to the generator and shut off all of the breakers on it then turn them back on. Now start the generator and see what happens.

[BeachRV]

Did you possibly trip the breaker on the generator?

[Kiawah]

Did you possibly trip the breaker on the generator?

He indicated he was getting 120 out of the generator.

I checked the power running to the transfer switch from the generator with a volt meter and it was 120