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Old 05-04-2019, 07:23 PM   #1
Junior Member
Brand: Thor Motor Coach
State: Illinois
Posts: 8
THOR #12237
Nothing works

The house batteries on my 2018 Thor Chateau 31W died after their first winter-over, so I thought I'd just put in some good quality new lead acid. first thing I noticed upon disconnecting the old batteries was that there was no battery-to chassis negative wire. is this normal? Or have I been driving around with no house batteries, so to speak. we never dry camp, just go from campground to campground, so I'm wondering. the ONLY negative wire goes direct to the inverter.
Upon installing new batteries, wire for wire, nothing works. Nothing. Pushing the master switch button produces total silence. I've checked 12V to the inverter, good. Ive checked what fuses I can find, all good. I've checked the relay I found located forward of the battery box underneath, it appears to be set, but its actually not possible to reach, so?

I know that the master switch button closes a relay somewhere, but I don't where, possibly underneath the refrigerator where the inverter is, but that is such a rats nest of wiring I'm totally lost
What did I do to get myself into this predicament? it started out so simple. Help!

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Old 05-04-2019, 09:04 PM   #2
Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 1,866
THOR #6411
Batteries won't work without a good chassis ground. All the circuit breakers, high amperage circuit breakers and relays work on the positive side of the battery. I suggest you dropped the ground cable when removing the batteries. Look in the back of the battery compartment or under the coach for the HD chassis ground cable. Since you have an inverter, the ground is probably a 0/0 cable or possibly a 0/2 depending on the length of the run.

Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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Old 05-06-2019, 03:47 AM   #3
Senior Member
SANDDOG's Avatar
Brand: Thor Motor Coach
Model: 2017 Miramar 34.2
State: California
Posts: 133
THOR #14761
Wow I I agree got to have a ground so sorry.
Miramar 2017 34.2, roadmaster front & rear sway bars, sumo shock, Roadmaster stabilizer bar, Koni shocks, F150 crewcab coyote motor , 2004 40th #26th edition 911, E350 2 door coupe, Mini Paceman 2013 6 speed manual toad/ RV
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