Plug in a USB charger or something else with a light and then close the car up as if towing. Watch the light from the outside and if it turns off, you have your answer. I had to run a direct connect plug for my brakes, but I also have to disconnect the battery. On some cars, you can move the outlet fuse location so that it stays on full time rather than when the key is on. My guess would be it is turning off in 10 minutes, which is the timeout for all the accessories including the radio. If you have more than one outlet, try them too.
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2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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