Welcome to 2CarPros.
The power comes from the same place. If you look at the schematic I attached, you will see that the brown wire that powers the license plate lights attaches to the tail lamp circuit. However, there are a couple splices that may be causing the problem. Check to make sure nothing is broken or corroded.
Let me know if this helps or if you have other questions.
Take care,
Joe
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Sunday, September 1st, 2019 AT 8:19 PM