Hello,
You have a tail light relay that is stuck on and needs to be replaced. Here is a wiring diagram for the running lights so you can see how the system works and a guide to help you test the relay once you find it from the diagrams below.
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
The relay is under the dash on the drivers side here are fuse and relay locations so you can see where to find it. I would save this page in your favorites for future reference.
Check out the diagrams (Below)
Let us know what happens and please upload pictures or videos of the problem.
Cheers, Ken
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Tuesday, February 27th, 2018 AT 10:20 AM