Most brake controllers, like the Tekonsha Prodigy P3 Trailer Brake Controller, # 90195, will stay active for several minutes after the vehicle is turned off. They will eventually go into sleep mode so you should have no issues with it running down the battery on your Ford F-150. view full answer...
The MaxxTow Magnetic Tow Lights part # C6304 are designed to be placed on a towed vehicle and then powered using a four way trailer connector on a tow vehicle. The four way trailer connector on the tow vehicle is then likely ran through an integrated trailer lighting circuit which contains fuses, relays, and power from the battery.
If you wanted to wire the MaxxTow Magnetic Tow Lights directly to the towed vehicle then you could use pretty much any standard automotive relay and switch... view full answer...