Based on your information, you need a stop light switch to complete your flat towing setup of your Fiat which is very common. I recommend the Roadmaster Stop Light Switch Kit, Item # RM-751455. This switch wires directly into the fuse box for constant current.
Before flat towing your Fiat, be sure to consult the owner's manual for recommendation or suggestions. I have also included some helpful links to additional information for you to check out. view full answer...
The Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole # HM47320 and the other adapter you used most likely are not the issue. I recommend testing your 6-way connector with a circuit tester like # PTW2993 to ensure you have both brake and turn signal function on each of the lower pins.
If you have both the right turn and stop and the left turn and stop, then we know your vehicle connection is good. Since we know your trailer works with other vehicles,... view full answer...
If nothing at all is working then the ground wire for your Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 is likely the issue. I recommend checking that it's making a good connection to the frame of the vehicle and isn't starting to corrode. If that isn't the issue then you'll need to connect to the motorhome or another vehicle with a 7-way connector and then put on your light signal (you can just start with running lights) and then trace the wires back starting at the... view full answer...
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