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Old 07-09-2020, 10:50 PM   #1
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Brand: Thor Motor Coach
Model: ACE 29.2
State: Tennessee
Posts: 11
THOR #11004
No power to AC or Microwave

2015 Thor ACE 29.2
No power with generator OR hooked up to 120.
Checked the breaker box. Flipped them all off and back on.
Checked the breaker in the battery compartment.
Checked the breaker in the engine compartment.
Checked GFI
Is there a breaker somewhere I donít know of?
What am I missing?
Thanks

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Old 07-09-2020, 11:16 PM   #2
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
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THOR #12751
No power to AC or Microwave

Iím not familiar with the ACE but Iím assuming you have 50amp service. If that is the case, it sounds like there is a problem with one of the 120v lines coming into the coach (assuming the A/C and microwave are on the same line).

Since it behaves the same with the generator and shore power, Iím going to rule out the transfer switch.... although there could be a loose / bad connection on the output of the transfer switch so that is one place to look.

There are could be an issue with the main breakers in your power control panel. There should be two main 50a breakers controlling the power input.... one for each line. You can check for a bad breaker or a bad connection coming into the power control panel as well.
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Old 07-09-2020, 11:32 PM   #3
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THOR #4735
if neither work on Shore or Gen, but everything else '120v' 'seems' to be working, it 'could' be a loose wire on one of your 50amp Main Breaker sides, since there are two.
These could also be the case within your ATS(auto transfer switch)... either way, check all 120v wire connections in the Main Panel, the ATS.

Are you absolutely SURE all other outlets and other 120v appliances(elec water heater) are actually also WORKING?
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Old 07-10-2020, 12:01 AM   #4
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Brand: Thor Motor Coach
Model: ACE 29.2
State: Tennessee
Posts: 11
THOR #11004
Actually itís 30A.
Broke out my meter and tested the breakers. Theyíre good. Got 120 to them.
Realized I donít have 120 to anything, even the outlets.
Weird...
Schematic I found online is pretty much useless.
Iíll keep digging. thanks.
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Old 07-10-2020, 12:15 AM   #5
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THOR #12751
So you are saying you have 120V at every breaker but no power to any outlets or appliances? Where are you measuring the voltage?

If you have 120V coming into the power center but nothing coming out, then it sounds like a loose wire going into the neutral bus bar or a loose wire going into the breaker bus.
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Old 07-10-2020, 12:20 AM   #6
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Model: ACE 27.1
State: Florida
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THOR #7035
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Originally Posted by Philm1 View Post
Actually itís 30A.
Broke out my meter and tested the breakers. Theyíre good. Got 120 to them.
Realized I donít have 120 to anything, even the outlets.
Weird...
Schematic I found online is pretty much useless.
Iíll keep digging. thanks.
Which breakers? The ones where you plug in? Or the ones in the coach?
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Old 07-10-2020, 01:15 AM   #7
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Brand: Thor Motor Coach
Model: ACE 29.2
State: Tennessee
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THOR #11004
Looked up what an ATS was. Watched a video. Uh oh...
Found it under the bed. Itís fried.
Gotta love the internet.
Thanks guys
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Old 07-10-2020, 11:03 AM   #8
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THOR #12751
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Originally Posted by Philm1 View Post
Looked up what an ATS was. Watched a video. Uh oh...
Found it under the bed. Itís fried.
Gotta love the internet.
Thanks guys
If your transfer switch is fried and neither the shore power or generator relay is engaging, then you would not get power to the breakers in your power control panel.

When you said you had power at your breakers, that is why I said it would likel not be your transfer switch.

I have seen transfer switches where the relays fail on one side and you have shore power or generator power but not both.
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Old 07-10-2020, 12:43 PM   #9
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THOR #7035
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Originally Posted by Judge View Post
If your transfer switch is fried and neither the shore power or generator relay is engaging, then you would not get power to the breakers in your power control panel.

When you said you had power at your breakers, that is why I said it would likel not be your transfer switch.

I have seen transfer switches where the relays fail on one side and you have shore power or generator power but not both.
That's why i asked "which breakers?"
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