Fiat 500 for flat towing questions

I towed a Fiat 500, manual transmission, for 2 years. Did a dedicated power line for the Brake Buddy. Great little fun car. No key needed. Never had a dead battery.

Suggest you follow the manufacturer’s instructions.

Dave, you want to check your owners manual, look for "Recreational Towing" to see what the steps are for flat towing your Fiat 500. Your vehicle should be flat tow-able (based on my past research), but the Fiat 500X is not. The additional 12v from the RV is a good idea so you don't drain you're battery.

Only the manual-transmission Fiat is flat-towable.

The key isn't needed for the steering.

The lighter/accessory outlet is switched by ACC. You could jumper the breaker to make it always live, run a new wire to an outlet or use an accessory battery pack. The Fiat forum folks appear to believe the jumpering the breaker won't blow up anything but no one's actually done it. I'll do that when I get around to installing the brake. I'm legal without braking but I intend to go with a RVI Brake. I have a Roadmaster air brake rig I used on the Tracker but it won' t work with the Fiat, and it's kind of an overall kludge anyway.

If it were me I would run a dedicated outlet front he battery to power the brake system. And then run a charge wire from the RV to keep the battery charged.
The steering wheel does not lock with the key out.

Where did you run that line inside?