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Old 09-25-2022, 11:10 AM   #1
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No 120 volts from generator

Getting ready to go travel, and checking everything out. May I say first this will be our first trip in this unit, Coachman Concord 240RB. The genset is a Cummins Onan 4000 with 70hrs, is a 350 chassis with 13,500 miles. Checking out the unit and the A/C will not come on with the Generator. Checked the breaker for the Gen, the A/C does operate on shore power. What am I missing guys/girls?
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Old 09-25-2022, 11:18 AM   #2
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Is it one of the type that you plug the shore cord into a generator outlet.
The outlet would be in the compartment with the cord.

Does anything work on generator power, like the microwave ?
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Old 09-25-2022, 11:34 AM   #3
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The generator output and the shore power must be kept apart. To do this various systems have been designed. The simplest is to unplug from shore power and plug into the generator as posted above.

Many RV's have an automatic transfer switch. The ATS detects where voltage is available and decides where to connect.

ATS switches are subject to arcing internally when they switch. Some models are better than others at surviving frequent arcing. Some can be repaired. Others are better just replaced.

Some RV's have manual transfer switches. You must throw a switch to use one or the other source.

Of course all of these systems have fuse and or circuit breaker protections.

RV's are rolling earthquake machines. Loose and corroded connections are par for the course.
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Old 09-25-2022, 12:51 PM   #4
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Generator power

To the previous author, yes it has a plug, I assume it runs on shore power when plugged in but to run off the generator it has to be plugged into the box where the cord is stored, it has a breaker mounted on the generator itself, a cord disconnect, and what else should I check before the repair shop?
And, where are all these contactors/transfer switches and such located by chance?
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Old 09-25-2022, 12:52 PM   #5
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Generator

Sorry, the generator is not putting out 120v, no plugs, A/C, etc.
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Old 09-25-2022, 01:17 PM   #6
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If you just plug the cord in, there are no other transfer switchs, you do the transfer with your cord.

Switch off, then on, both the inside RV and generator breakers. Sometimes they trip and need a reset.

Most generators don't run if they are not making 120 volt power, so it may be a loose wire somewhere.
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Old 09-25-2022, 05:13 PM   #7
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Is the generator low on oil? Some shut off when oil level gets low.
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Old 09-25-2022, 05:23 PM   #8
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OK, let's back up.


Is the generator running? Normal RPM?


Have you turned OFF and back ON the on-generator breakers?
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Old 09-25-2022, 09:36 PM   #9
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As others stated........

Check the primary circuit breaker on the generator itself by clicking it off/on a couple of times. It takes some strength to reset that breaker properly.

Also check the main breaker inside the RV in the same manner.

You manually plug the generator power into the motorhome (no power transfer switch) so that simplifies trouble-shooting.

Plug the RV into shore power (your brick and mortar house) and make certain everything operates normally. Use an adaptor to hook up to your house as needed to perform many 110V checks. Make sure to turn on and off every feature one at a time as not to trip your house breaker. Test your a/c unit last.

Using a volt meter or adaptor with a light bulb at the generator output receptacle, run the generator and verify it outputs 110V.
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Old 09-26-2022, 07:29 AM   #10
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No 120v from Generator.

UPDATE: We have a repair service connected with the purchase. This is what we worked up to. 1. The shore power works as it should and there are no problems. 2. The generator does not supply 120v when the shore power plug is inserted into the generator supply outlet with the generator running. 3. The generator starts and runs as it was designed. 4. The generator is supplying 120v to the generator outlet plug when it is running and all the main breakers are on and have been reset just in case. My next test is to check for voltage in the panel box with the generator plugged in and running. I do not have a schematic of the RV so we will have to make assumptions how the wiring was run.When the service tech called back, we talked about the main cord being bad due to the close proximity to the RV wall when plugged in to the gen plug, so, we decided to check the plug for being intact in it's make up inside the junction box. My previous electrical experence leads me to the simple route first before tearing into the big stuff, check the wear points first, which is the plug. Will update as to what I find. Thanks for all your ideas cause I know they come from experence.
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Old 09-26-2022, 07:51 AM   #11
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I had a 24 ft C that had to have the cord plugged into the outlet as mentioned and a switch inside that selected between shoreline power and generator power.

It came from the factory that way. Not a great setup.
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Old 09-26-2022, 07:56 AM   #12
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Nothing wrong with plug in shore power cord to generator outlet.


Simpler (and less $$) than an ATS.


Certainly easy to troubleshoot.
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Old 09-26-2022, 08:04 AM   #13
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https://forestriverinc.help/#/coachm...ultiple-709890

https://forestriverinc.help/#/coachm...ultiple-676301

The owners manual does suggest you may need to plug the power cord into the outlet inside a compartment. Hopefully that is possible to do since you might want to run the generator while driving. Watching one video shows a shoreline cord connected to the outside of the rv which leads me to believe that coach has an automatic transfer switch.

In any case, one of the videos on their web pages shows where the generator circuit breakers are located. They may not appear to be tripped so toggle them off and on.
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Old 09-26-2022, 08:24 AM   #14
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Not sure it was mentioned but is it just the AC that doesnt run or is 120v off to all the receptacles in the rig? Many smaller rigs with one or two ACs and a smaller genset, are designed with mostly manual interfaces to control 120v loads, eg, separate plugs, inside switches, etc.
PS--not all RV service/repair providers are created equal--get a second opinion!
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