Refrigerator- Works off 110 ac (shore pwr or Genny) OR with propane and 12 volts control voltage. It does not work from 12 volts alone.. Set the switch on the front panel to AUTO and if 110 volts is available the green light will be on. If not- the light next to GAS will be on. The fridge does not use much propane when on gas. (should last several days or more). You should not have to run the genny just to power the fridge.
Another suggestion- since neither your water pump (12 volt) and the fridge propane side (also requires 12volts) don't work it is possible the "salesman switch" is off. This is the Battery Disconnect switch located inside the cabin door, on the left side, bottom switch, move it to "USE".
3rd Brake light- Camping World solution is totally unacceptable. If you bought it there they need to fix it with the correct part. It should be available from Thor.
Contact Thor 1-877-855-2867, for their help, as HC8RXQ recommends.,.
Thor has a website :
https://thormotorcoach.com/motorhome-owners-resources/ Select owners manuals and drill down to 2015 Siesta Sprinter. Free download. It is easy to copy to a CD and you can have it readily available.
Once you get it ironed out, the 24ST is very enjoyable.
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