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Old 12-23-2018, 08:02 PM   #1
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Brand: Thor Motor Coach
Model: Vegas 24.1
State: Texas
Posts: 5
THOR #14032
Generator running - no house power

On holiday road trip from TX to VA we lost power. Found a lot of good suggestions on the forum but no luck fixing issue. Done: 1) confirmed no blown fuses in converter and reset all breakers, 2) switched genset breaker to off and back to on, 3) switched 50amp breaker in house battery compartment off then on.
Upon arrival we hooked up to shore power and everything has power. Thor CS responded to email with thought it may be bad transfer switch that needs to be replaced.
Any other ideas? If it is transfer switch where do I find it and how difficult is it to replace?
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Old 12-23-2018, 08:19 PM   #2
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Which model Vegas do you have?

If you have a 24.1 the transfer switch is under the drivers side rear bed--pull out the two drawers between the beds and look back there.

You could just have some bad wiring to the transfer switch as its likely they used wire nuts and at the switch the wires may change from stranded to solid core.
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Old 12-23-2018, 08:44 PM   #3
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THOR #14032
Thanks JamieGeek. Updated profile, have 24.1.
Was hoping I might be missing something. I've seen other threads discussing issues with those wires/wirenuts. Will investigate and share results.
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Old 12-23-2018, 10:32 PM   #4
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Good luck with the repair; please let us know what happened!
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Old 01-02-2019, 02:40 AM   #5
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THOR #14032
Back from trip and able to investigate further. Took out drawers between beds and did not see anything to driver's side. Removed one of the driver's side bed panels but that revealed nothing. See photos - out of curiosity anyone know what the wires are leading to?
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Old 01-02-2019, 02:49 AM   #6
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THOR #14032
After taking out drawers between beds and searching to driver's side I looked left and there was transfer switch. It can also be accessed through passenger side bed hinged door to fresh water tank. See photos.
There are 6 pairs of wires joined by wire nuts. The task of replacing transfer switch looks daunting as I'm not an electrician.
How can I confirm it is not operating correctly?
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Old 01-02-2019, 02:58 AM   #7
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Wow, I don't think mine is right there. Hmm

It really isn't that daunting but if you don't feel comfortable doing anything with that then don't and have an electrician or someone more knowledgeable work on it.

The wires aren't labelled but you'll have two inputs (external power, and generator power) and one output going to the converter/breaker panel.

Make sure the coach is unplugged and the generator is off (e.g. no 120V power on any wires) then I'd grab the wires and give them a tug at the wire nuts--see if any pop out of the wire nut (the good news is that looking at your pictures nothing has shorted or melted).

Hey look there is a troubleshooting guide in the manual:
https://www.progressivedyn.com/wp-co...8A-English.pdf
(although that troubleshooting guide has you poke around in there with the generator running--if you're not comfortable doing so then I'd find someone that is).
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Old 01-03-2019, 01:56 AM   #8
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I'm gonna back up a step and ask - what power did you lose???
Based on what you tried - 2 of the 3 are on the 12v side of life - and would have nothing to do with the transfer switch...

Quote:
Done: 1) confirmed no blown fuses in converter and reset all breakers, 2) switched genset breaker to off and back to on, 3) switched 50amp breaker in house battery compartment off then on.
1 (blown fuses in converter part) and 3 have nothing to do with 110 power in coach...


You said you were running the generator and had no house power.
What stopped working?


I'll assume lights stayed on and appliances like TV and Microwave wouldn't work? If so the genset breaker (which you checked) or transfer switch could be the issue... (but as Jamie said - and your pic shows - nothing melted which is good...)

Should hear a mechanical click as the transfer switch moves from genset to shore power and back.
Could be as simple as loose connection - or could be the switch itself...
Since shore power works - would be the genny input wires to check.
Unwrapping each of the connections with NO 110 power present to check for a loose/disconnected wire.



If the loss of power included lights - then something else going on...
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Old 01-03-2019, 03:52 AM   #9
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Please help us help you. When you "lost power", what items stopped working?
TV, Frig, Microwave, lights? Your transfer cable connections show no visible problems. Usually when the problem is in there the wires will look like roasted marshmallows.
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Old 01-03-2019, 10:52 AM   #10
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Lost power

Recently went through this in my Vegas (25.5).
Had some electrical problems and took in for warranty repairs.
My radio/nav unit would not turn on (at all). The bed area fan had one speed.
None of the inside DC lights would turn on.

With no shore power nothing would turn on.

My main power disconnect switch is located just inside the door under the sink.

Was diagnosed as the main power switch not working. It seemed that the DC was lost completely after AC shore power removed.

Switch was replaced and every electrical problem went away.
Gary

By the way I'm a new guy here, but not a new RV'er. Howdy.

I am looking for someone to post a picture of the inside door window. I believe mine is missing a part (another story) and need your pic to confirm.
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Old 01-04-2019, 09:51 AM   #11
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Quote:
Originally Posted by etcmss View Post

I am looking for someone to post a picture of the inside door window. I believe mine is missing a part (another story) and need your pic to confirm.
Which door do you mean?
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Old 01-04-2019, 11:35 AM   #12
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Lost power

the people door with the window.
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Old 01-04-2019, 02:58 PM   #13
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it's easy to confirm the operation of the ATS:

- if you plug into any shore power, no matter whether 50amp, 30amp, or even just a 15a household outlet, you should IMMEDIATELY hear a 'thud' from inside the coach, where the ATS is located. It is transferring the connection to the Shore Power side of the switch, with a magnetic latching trigger. You should now have power.

- if you are not plugged into shore power, turn on your Generator. You should have a 30second or so wait, and THEN you should hear the 'thud' of the ATS switching over to the Generator side of the switch. You should then have power again.
This would also work the same even if you are already plugged into shore power, but I didn't want to confuse the issue - but the ATS 'defaults' over to Generator power, using it instead of shore power, but will also switch back over if you then turn the generator back off. That's what it's designed to do.

if you do not hear a 'THUD', or have power for either of these, you could have an issue with EITHER the ATS and it's wiring, OR the power source itself(such as a tripped breaker), OR lost a wiring connection within or at the ends of your Shore Power CORD.

Tripped breakers on generators are the typical 'help' issues for first-time users of generators in motorhomes, as they don't immediately recognize that the generator has it's OWN breaker(s)...(ME!, a great learning experience)...

Shore Power, especially 50amp double-pole RV service, is another culprit. If either side of the campground's breaker wiring is not fully seated, or tightened, they can also cause you to lose power to 'some' of your coach, for 50amp coaches.

The ATS's wiring can easily be assessed when you find where it's actually located. Our's is hidden behind a panel, under the foot of the bed, in a hidden 'chase'. Either of these wires could be loose, could have worked lose during heating of the wires during usage, or may have never been tightened properly at the factory(mine!).

Shore CORDS can also be suspect, since the wiring within them can pull from the ends, even within the cord end itself, but is not normally the first culprit in this case.
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