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Old 04-28-2018, 11:49 PM   #1
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Brand: Thor Motor Coach
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Question Where is Battery Isolator Solenoid?

Help! Anybody know where the battery isolator solenoid is in my 2003 Thor Four Winds Five Thousand? I've also seen it called a battery disconnect solenoid. (I'm not talking about the solenoid under the hood on the firewall.) I can't hear it clicking. I've read that it is supposed to be behind the 12 volt fuse box under the bed, but I can't find it there. Can anybody tell me what it looks like and where it is?
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Old 04-29-2018, 03:14 AM   #2
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Model: A.C.E. 30.2
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THOR #8054
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Old 04-29-2018, 03:30 PM   #3
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Thanks Bruno1950. At least now I know what it looks like. But I still can't find it in or near the electrical compartment under the bed, where the AC breaker/DC fuse box is located. Could you please tell me where yours is mounted?
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Old 04-29-2018, 03:43 PM   #4
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In my 2013 four winds 28z it looked like this. It was next to my toliet in a box- the breaker panel was on the other side of the wall.
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Old 04-30-2018, 07:24 PM   #5
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Model: 2015 Vegas 24.1
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Matt:

Don't know if you found it yet but Bruno's picture is the same as mine in my 2015 Vegas. I'm thinking it's the same in your Four Winds. And it is one PITA to find.

I found mine by having my wife cycle the USE/STORE switch on & off while I tracked down where the relay click was coming from. Eventually found it behind the grill in my "hallway" next to the converter box. Opened the grill (that's also where my water heater bypass valves are located. Moved the heater ducting aside and found the relay mounted to the backside of a wooden bulkhead under the refrigerator.

I wasn't having a problem with it -- I just wanted to knw where it was in the event that I had a problem sometime in the future. Had the contacts of the relay not been clicking when activating the USE/STORE switch, I never would have found it.

Here's a picture of mine in situ:
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Old 05-11-2018, 11:49 AM   #6
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Thanks to everyone for your replies. I finally got tired of looking for the solenoid and took the old RV to the local RV repair shop. Turns out the previous owner had rewired the 12 volt system to bypass the converter (who knows why!) so the auxiliary battery wasn't charging. I really don't understand the mechanic's explanation because the 12v system worked OK for me for 2 years before it inexplicably broke down. And the mechanic says there is no battery disconnect solenoid in this old model. Go figure. Anyway, everything is fixed and works correctly now. Thanks again!
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Old 05-11-2018, 12:21 PM   #7
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THOR #5725
So what did he fix?
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