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Old 08-18-2019, 05:49 PM   #1
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Lost power to top half of motorhome

Good Evening,


We have a 2011 Tiffin Phaeton, the motorhome has been running hooked to the house non-stop. Cranked the motorhome and let it run. Turned off the switch and everything stayed running. Then all the lights/air conditioner quit working. Only the top part of the motorhome went out. We checked the breaker to the house and tripped it. Looked at fuses. I have read about a main breaker and a GFCI breaker. Would anyone know where those are located or any other ideas on what could be the issue. If you need anymore information, please let me know.



Thank you!
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Old 08-18-2019, 07:59 PM   #2
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Sorry your first post is about problems .

I would suspect the with lights ( 12 volt powered ) and air conditioning shutting off ( A/C operation 120 volt BUT the thermostat is 12 volt to control the furnace ) so your issue could be a 12 volt fuse or two .

When you say the top ; do you mean that 120 volt outlets in the walls are working ?
Do you have power to your microwave. ?

IF!!! there was an issue with an inverter , being operational when the engine was running , then any delay with switching to shore power when the engine was shut off , the air conditioning may have overloaded the converter and tripped a breaker on the inverter OR blown the inverter's 12 volt power supply fuse.

Do you have a multi-meter ?

Have you seen any fuses in your coach's battery wiring, that look like the picture below?
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Old 08-18-2019, 09:48 PM   #3
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Welcome!

What do you mean by "top part of the motor home"? What you are describing sounds like total 12v shutdown due to low batteries or faulty connections. All of the lights, thermostat, etc run on 12v. Check to make sure the house batteries are turned on and the charger is working. Also, check the battery disconnect switch by the entry door.

Do you still have 120v power to the outlets? You should have about three GFCIs. Usually there is one in the bathroom, maybe another in the galley area and one or two in the basement areas.
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Old 08-19-2019, 05:45 AM   #4
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Check the 12v switch by the entry door. I don’t know why many manufacturers leave this critical switch unprotected from a casual movement.
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Old 08-19-2019, 05:52 AM   #5
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Good Morning, Thank you for your fast replies. It was the switch by the door. It had been accidentally hit, bring in supplies. In all the years, that has never happened. Again, thank you for your input.

Have a wonderful day.
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Old 08-19-2019, 11:25 AM   #6
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That will do it, that switch near the door kills all your 12 volt system. I did it also and it took me a while to figure out what happened.
No fridge and no lights is dead give away.


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Old 08-19-2019, 12:43 PM   #7
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Yep, think we all have been there done that at one time or another. The one in our Itasca was in the step well and I was always hitting it with a broom when sweeping the steps.
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Old 08-19-2019, 11:11 PM   #8
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Thanks for wrapping up your post , glad it wasn't a $$$ repair .

Reading these replies, I'm glad Newmar put the ; coach battery disconnect ;switch ABOVE the steps behind a cabinet door , at least on my vintage coach.
Hard to find , but impossible to touch by accident.
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Old 08-19-2019, 11:17 PM   #9
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Quote:
Originally Posted by Aerocrazd View Post
Good Morning, Thank you for your fast replies. It was the switch by the door. It had been accidentally hit, bring in supplies. In all the years, that has never happened. Again, thank you for your input.

Have a wonderful day.
I have taped over that switch for the same problem.
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