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Old 07-14-2021, 04:15 AM   #1
Junior Member
Brand: Thor Motor Coach
State: California
Posts: 2
THOR #24185
No 12v power when coach unplugged

Hello one and all,
This morning after I unplugged my 2017 Citation 24ss, the coach went dead. I checked the use/store switch and nothing happened. This afternoon, I spent a little more time troubleshooting and found that the main dc relay is not operating. I have checked the relay, and it is in working order. I also pulled the switch out of the wall and checked it. It also seems to be in working order. The batteries are putting out and operating my inverter. I have also checked the breakers and all the fuses. All ok there. There are 6 wires on the DPDT switch and without a diagram, I am not sure which wires to jumper to see if I can get the relay to operate. Any help or suggestions would be greatly appreciated!

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Old 07-14-2021, 04:21 AM   #2
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16ACE27's Avatar
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 9,792
THOR #7035
The switch has + and - on the center wires.
Operating the switch in one direction sends + 12 VDC to the relay control
Pushing the other way reverses the polarity to the relay control.
The relay will not operate if the house batteries are dead OR if the 50 Amp DC breaker near the batteries is tripped.

See this thread:
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
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Old 07-16-2021, 03:31 PM   #3
Junior Member
Brand: Thor Motor Coach
State: California
Posts: 2
THOR #24185
Thanks 16ACE27,
I have seen that thread. Did not help me. I will look again at the switch and check for +/-. Everything works ok with the generator or shore power. I took the relay apart and it is okay. Contacts are serviceable and the coil is intact. I checked the switch and it looks good with the ohmmeter. I guess my next step is to check out all of the wiring.
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help please

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