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Topic: 120v outlet shut off (Read 211 times) previous topic - next topic

120v outlet shut off

my 120v outlets shut off occasionally .... and come back on after less than a minute .....  i can't seem to find a fault !!!! how could i troubleshoot it ? i did ck the breakers .... all OK !!!! all those 120v outlets go through  a junction box (#2)  with 2 main breakers but all tests OK ..... this is on my 2003 U320 . the diagram shows  main (40 amp) breaker there but there are 2 30amp .... one each bus .... THE POWER WILL OCCASIONNALLY GO OUT WHEN I PLUG THE COFFEE MACH ( but not always ) one time it went out when i turned the TV on !!!!

stumped ....
Ann & Carl Cote
2003 U320 4010T
cummins 450
Chevy Sonic

Re: 120v outlet shut off

Reply #1 –
If you have a cord real you may have a bad connection at the commutator/brush connection. Look for a bad brush, brush spring, brush holder, and burnt spots on the commutator rings and check the connections of the shore transfer switch.  If it happens on the generator also then you need to look at the transfer switches for sure.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: 120v outlet shut off

Reply #2 –
Quote from: ccote –
my 120v outlets shut off occasionally .... and come back on after less than a minute ..... 

Do you lose complete 120V power to the coach?

Is it just at the current park or does it happen everywhere?

Have you noticed what the voltage is on the Powerline monitor readout right before it happens and/or do you have an add-on surge protector with a readout?

If it's happening at one specific park/site/location, it could be over/under shore voltage and either the OEM Maverick transfer switch is cutting out as a result OR if you have an EMS (like a Progressive unit), it could also be cutting out for low/high shore voltage.
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320
 

Re: 120v outlet shut off

Reply #3 –
Also, check if the symptoms are the same on generator as on shore power.

That will help narrow down the failure point.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020