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Hi my name is Robert.....
Sounds like the solenoid for the disconnect switch is at fault, when you hit the battery disconnect switch it should allow power inside, if you have good voltage at the battery will need to find the solenoid, sometimes when you hit the switch you can hear the solenoid click, if you can not locate it by sound follow the cables to the solenoid, one cable will go directly to it. Once you find the solenoid you will see two LARGE posts, get an insulated wire and jump the LARGE posts and see if power comes on. I want to say on some of the Jayco's the solenoid could be under the bed but do not remember what models. IF you have NO voltage at the solenoid, look for a tripped breaker between the batteries and solenoid. IF you have more questions or concerns please feel free to contact me, I am around daily and respond when I can, follow ups are included.... Robert
I would double check the connections on the battery to be sure the polarity is correct and then check the converter. It may be bad and shorting out the 12 VDC system. I believe on that model it would be under the bed. IF everything was off when you hooked up the battery you should have no spark or just a brief faint one. It might also be on or more of the shortstop breakers tripped. Use a 12 VDC test light or small digital multimeter to test for power and follow it along. The shortstop breakers are usually near the battery. It would be helpful if you had the wiring diagrams for this and if you contract Jayco Customer Service and give them the last 8 of your VIN number they can forward them to you.
Oops.............I didn't see Robert had posted on this already. I guess we were both working on it at the same time.
Check the solenoid and get back to me if needed. Good chance it is at fault if you have good DC voltage at the battery and not inside the RV.... Robert