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Old 02-23-2021, 10:44 PM   #1
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Brand: Thor Motor Coach
State: Massachusetts
Posts: 6
THOR #18328
Electrical gremlin

Help please?

Got back from a road trip. Left the coach (2018 ACE 30.3) unplugged in the driveway for two days.

Found these things not working on 12V:
Fridge - checked with a meter - not getting 12V
Front of coach ceiling lights
Bathroom ceiling light
Bathroom vent fan

Lights work on 110V.

Everything else is working on 12V - water pump, drop down bunk, ceiling vent fan, stovetop vent fan, slides, ceiling lights in the bedroom.

Checked the logical fuses, they were fine.

Any ideas?

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Old 02-23-2021, 10:48 PM   #2
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Did you check your coach batteries for their voltage?
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Old 02-23-2021, 10:59 PM   #3
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I did not. I assumed since everything else was working that they were supplying sufficient power.

They may have gotten low voltage when sitting for a couple days but they should be good now.

I’ll check anyhow, thank you for the idea.
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Old 02-24-2021, 08:57 PM   #4
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All the fuses are good. Batteries are both putting out 13.6V. What looks like some sort of breakers in the battery compartment are all good.

Anyone ever seen a second fuse panel anywhere?
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Old 02-24-2021, 10:07 PM   #5
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Brand: Thor Motor Coach
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I think I figured it out!

The wire coming out of the back of the fuse panel seemed to have a loose connection. I was trying to jam my multimeter probe into it and all the sudden I hear the fridge click on. This weekend’s project: make sure all the wires out of the fuse box are snug.

Thank you all for your ideas!
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Old 02-24-2021, 10:07 PM   #6
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Here is a thread with a 110/12V layout, if you do not have it already.
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