Disclaimer - I am not a car mechanic, electrical engineer or anything like that - just a weekend enthusiast.So my local car audio shop hardwired my dashcam, radar detector, and USB Type C charger in my Expedition on switched fuse #37 (heated steering wheel). All of the hardwire units work great without any issues, however now my steering wheel is intermittent. Sometimes it works fine, sometimes it doesn't work at all, and sometimes it will work fine initially, then shut off.
Anybody either experienced this before or have any idea what might be causing this?
For me it sounds like poor cable connection; or voltage drops - but it’s usually car battery/alternator issue and should affect other systems as well.
I connected my dashcam battery packs to fuse #37 - everything is good for almost two years now. Those battery packs draw more power than any dashcam, radar detector and USB-C 100watt device all together.
So I would say something is not right in your setup. Take it back to the shop.