Q: what happens to a car when you wire up a led bar incorrectly?

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I recently installed a led bar and I don't know if that is causing my car to turn off suddenly while I'm driving. This does not happened ever day, about last week it turned off on me and today in the morning the same problem happened. I installed the 15" led bar with a wiring harness that has a relay and every thing.
My car has an automatic transmission.

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