120 Volt Not Working

Question: My 120-volt power does not work when the generator is working. What could be causing this problem? Answer: I am going to take your question

120 Volt Not Working

by Ken

Question: My 120-volt power does not work when the generator is working. What could be causing this problem?

Answer: I am going to take your question to mean that your generator is not providing power to your 120 volt appliances.
If so, several things need to be checked.

First, begin with your generator. If you have an older unit you may have to connect your power cord to the generator.

Then, check to make sure that the generator circuit breaker(s) have not tripped. If they are tripped, reset them by turning them off and then back on again. When resetting the breaker(s), feel to make sure that the breaker(s) are good, over time they do tend to fail. If there is little resistance when reseting the breaker(s), then replace them.

Next check for a tripped GFI outlet and reset it also.

Go to your A/C power distribution panel and reset all of the breakers in that box. Remember to feel for weak breakers and replace any that seem too easy to reset or that will not fully reset.

Lastly, since you have a generator then you also have a power transfer switch that may have gone bad and is stuck in the shore power position.

If you have a trailer, then another possibility is a bad converter.

If you want to further diagnose the problem, read on.


Converter:

  • Huge caution: Never work on a converter while it is connected to live power unless you are skilled in electrical trouble shooting. The few dollars you save may cost you an injury or your life.

However, if you feel comfortable working on the converter, you can check to make sure that all of the converter connections good and tight and that there are no burned wires.

Do you have a good battery connected to the converter? I read somewhere that a bad battery can cause similar problems.

Also try resetting all circuit breakers in the converter and make sure that they are good.


Power Transfer Switch:

  • Huge caution: Never work on a power transfer switch while it is connected to live power unless you are skilled in electrical trouble shooting. The few dollars you save may cost you an injury or your life.

However, if you feel comfortable working on the power transfer switch, you can check the contacts to make sure that they are operating properly and that the contacts are not pitted or welded shut.

If you still do not have power at your outlets then you will need to take your RV to a professional to resolve your power issue.


Please let us know how you resolve your issue and the cause, so others can learn from your experience.

Comments for 120 Volt Not Working

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Jul 26, 2015

No 120 volt power from generator

by: Desertrek


Almost all generators have a master power switch or(master breaker)located somewhere near the start switch in the generator bay, on the generator. This is the first place I would go to diagnose the issue. It will look like a small black light switch, in most cases and may not be labeled. This is the case on all Onan genies that I have owned. Depending on the model year (as previously posted)there will more than likely be an automatic switch box that changes your power from shore to genie. They can also stick once in a while.
Plug in and unplug from shore power a few times will usually make it break contact and switch it to genie mode.(depending on where the switch is mounted, you should hear a clicking noise as it makes the transfer).
If you have an older rig (70’s or 80’s model)most of them were not equipped with the auto switch and you had to manually plug your power cord into a 30 amp receptacle mounted in the electric cord bay. Hopefully this helps and saves you a few bucks or time not having to take it in.


Oct 27, 2012

No Power while Hooked to Generator.

by: MarkKY


First, disconnect from your generator and hook to a known working source, as your house. If still no power, check your cord for loose blades on the plug. Check where shore power connects inside your box. Make sure ALL connections are tight, and wires aren’t blackened from arcing.

Make further checks with your breakers and fuses. Check GFCI breakers for age and wear, test and reset. If still no 120v, I would turn it over to an electrician, or take it to an RV center for PROPER repairs! Good luck!


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