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07-20-2018, 04:28 PM
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#1
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Member
Brand: Thor Motor Coach
State: Texas
Posts: 44
THOR #5409
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New Onan generator
Purchased new Onan 4000 ultra quite generator. Had it installed last week. Worked great for 8 hrs. Now when load is put on generator it bogs down. Before any load the plugs voltage read 120v. Turn on just AC. AC comes on a few minutes then bogs down generator. Reading goes immediately down to 90v then either AC kicks off and generator builds back up or both goes off. Same outcome if I only run the microwave so it’s not a bad AC compressor.
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07-20-2018, 04:48 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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Have you contacted the people you bought it from? Were they the same people that did the install? I assume it's warranted?
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-20-2018, 05:04 PM
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#3
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Member
Brand: Thor Motor Coach
State: Texas
Posts: 44
THOR #5409
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Yes. I’m a country touring musician so I’m not in one place very long. Contacted man that put it in. He said generator was new not his fault I’m overloading it. Could bring in but won’t be anything wrong with the generator. He is definitely not a nice service tech to work with and I’m seriously in a hot bind in San Antonio. I’ve turned off all breakers but main and AC still overloads. 3 year warranty. But it is hot out on the road with five dudes on the bus.
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07-20-2018, 05:11 PM
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#4
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Axis/Vegas Enthusiast
Brand: Thor Motor Coach
Model: Axis 24.4
State: Michigan
Posts: 9,837
THOR #1150
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Find an official Cummins/Onan service shop near you and call them.
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07-20-2018, 06:03 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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This is the closest Cummins Direct shop to you. There are several other RV dealers near you that are authorized but I'd go to Cummins first. Sounds like a ground somewhere...check where generator ground strap bolts to frame. The A/C alone is not overloading the generator. Something vibrated loose over that first 8 hour period...at least that's my guess.
Cummins Sales and Service
6226 Pan Am Expressway North
San Antonio, TX
210-655-5420
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-20-2018, 07:47 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,177
THOR #6411
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You probably have too much initial load on the generator before you turn on the A/C. Start the generator and go to the power panel (the one with all the circuit breakers). Turn off all the circuit breakers except for the main (probably a 30 amp) and the 20 amp A/C circuit breaker. Now see if the generator will accept the load - it should. Use this sequence - with only the two circuit breakers on - Turn the A/C on to "high fan" and let it run for about 10 seconds and then quickly rotate the switch to "low cool". An A/C needs about 40 amps for 1/4 of a second to start and then will settle down to about 15 amps steady. After the A/C has run for 5 minutes, you can switch to high cool if you desire. Now you can go back to the power panel and turn on the converter/charger circuit breaker but nothing else. You generator will only run the A/C with only one other device and maybe a TV, no microwave, no water heater. If you load it too much when the A/C compressor cycles it will stall the generator. You can buy a voltage/frequency monitor (about $50) to keep a eye on the generator. It just plugs into any 120 volt duplex receptacle.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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07-21-2018, 04:41 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: ACE 27.1
State: Virginia
Posts: 315
THOR #7607
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Quote:
Originally Posted by Beau388
You probably have too much initial load on the generator before you turn on the A/C. Start the generator and go to the power panel (the one with all the circuit breakers). Turn off all the circuit breakers except for the main (probably a 30 amp) and the 20 amp A/C circuit breaker. Now see if the generator will accept the load - it should. Use this sequence - with only the two circuit breakers on - Turn the A/C on to "high fan" and let it run for about 10 seconds and then quickly rotate the switch to "low cool". An A/C needs about 40 amps for 1/4 of a second to start and then will settle down to about 15 amps steady. After the A/C has run for 5 minutes, you can switch to high cool if you desire. Now you can go back to the power panel and turn on the converter/charger circuit breaker but nothing else. You generator will only run the A/C with only one other device and maybe a TV, no microwave, no water heater. If you load it too much when the A/C compressor cycles it will stall the generator. You can buy a voltage/frequency monitor (about $50) to keep a eye on the generator. It just plugs into any 120 volt duplex receptacle.
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Sounds like the generator isn't adjusting to the load. Cummins Onan is top notch. Hopefully your purchase was such that warranty will be honored.
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ComputerChips
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07-23-2018, 01:13 AM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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I think they have roasted to death.....
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-25-2018, 12:27 PM
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#9
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Member
Brand: Thor Motor Coach
State: Texas
Posts: 44
THOR #5409
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We barley survived
Generator Repair
We have struggled with our new Onan generator bought at Lone Star Generator Tyler TX. After 8 hrs it quit from working. Lone Star hung up on us 3 times while we were in a 100+ degree motorhome in Odessa. They Refused to hear the problems
We found our solution with Kyle Trailer Repair out of Troup. Diagnose the problem Immediately, which was within the generator and fixed immediately. certified Onan Repair and sales.
Highly recommend!!
Kyle Trailer Repair
9035716550
Generator was under warranty received a new one. Not one ounce of problem since
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07-25-2018, 12:28 PM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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"cool"!
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-25-2018, 12:31 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
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Quote:
Originally Posted by Codywayne
Generator Repair
We have struggled with our new Onan generator bought at Lone Star Generator Tyler TX. After 8 hrs it quit from working. Lone Star hung up on us 3 times while we were in a 100+ degree motorhome in Odessa. They Refused to hear the problems
We found our solution with Kyle Trailer Repair out of Troup. Diagnose the problem Immediately, which was within the generator and fixed immediately. certified Onan Repair and sales.
Highly recommend!!
Kyle Trailer Repair
9035716550
Generator was under warranty received a new one. Not one ounce of problem since
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Sure sounds like Lone Star is not a company to due business with!!!
Glad you found a reputable dealer and were taken care of!!!
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07-25-2018, 01:01 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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You should follow through with Onan/Cummins and report the bad dealer by filing a complaint. It would be my mission to have them loose their authorization to sell or service those products.
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-25-2018, 02:34 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
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Quote:
Originally Posted by The Gritz Carlton
You should follow through with Onan/Cummins and report the bad dealer by filing a complaint. It would be my mission to have them loose their authorization to sell or service those products.
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I agree x2 in spades!!!
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07-25-2018, 04:01 PM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Thor Vegas 25.2
State: Indiana
Posts: 301
THOR #7993
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Our Onan does the same thing, it's the one that came with the RV. Start gen, turn on air, gen dies out. It will work sometimes if it is warmed up really well but not always. We have an appointment next month for them to look at it.
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07-26-2018, 04:08 AM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: ACE 27.1
State: Virginia
Posts: 315
THOR #7607
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Don't forget to ask if yours is still under warranty. 2yrs or 2000hrs
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ComputerChips
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07-26-2018, 04:09 AM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: ACE 27.1
State: Virginia
Posts: 315
THOR #7607
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2yrs from your date of purchase.
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