Onan 6300 1/2 the output

[psandoz]

Hi all,

We have an Onan 6300 propane genset on our 2000 Damon Class A DP. On a recent trip we discovered that rear A/C and several 110 plugs would not work with the generator running. Quick volt meter test and I discovered one leg of the generator coming into the panel box is hot, the voltage on the other leg which powers the rear A/C is 0. I double checked with the shore line plugged in and I have full voltage on both 110 legs into the panel box.

Suggestions?

Thanks

[Rorytug]

There are breakers on the generator itself one of them has tripped would be my first inclination.

[Gary RVRoamer]

Yeap. Reset the breaker(s) on the genset. If that's not it, the auto-transfer switch has a bad relay and is not closing both power feeds from the genset.

[psandoz]

Thanks for the suggestions. Found one of the breakers tripped, reset it but still not getting full power. Checked the voltage at the transfer switch and I'm getting 120 on each leg. But I'm not sure why the switch is wired this way (Todd engineering PS250) see thumbnail with ? on bottom right. The wiring diagram on the panel top shows these terminals blank, but on this unit there are jumpers that look like factory install from load center (bottom left) to bottom right. Seems like this was defeat the purpose on the transfer switches. Thoughts?

[Gary RVRoamer]

If the bottom wire in the photo exits to the load center, then that looks ok to me. If the right side relay closes, that source feeds the load center. If the left side relay closes, than a different source feeds it.

[twinboat]

There are 2 relays. Left side top is shore power in. Right side top is generator power in. ( if your markings are right.)

Only one connects at a time so they use the jumpers, at the bottom, to send the power out to the main panel from either contactor ( relay ).

If you have 120 volts on both legs of the top of generator relay, wait the 20 to 30 seconds for the relay to close. Then if it's good, you should have power on the bottom 2 .

[psandoz]

Thanks for the suggestions. One CB was tripped on The genset. It would not reset, I sprayed it with contact cleaner and now it resets. Have full power now. Follow up question, one of the relays (I think it's the generator relay) hums when on shore power and generator is running. Sprayed it with some contact cleaner no noticeable change but it doesn't effect the operation. Any suggestions?

Thanks for all the good advice.