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Q: no trailer lights on 1999 Lexus RX300

I have no lights to my trailer. There is a small unit in the back of the car where the taillight wires are tapped and routed out to the trailer connector. There is no power to the connector. I assume the unit has failed. Can I simply splice into the car wiring for the trailer connector?
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My suggestion would be to get a wiring diagram before attempting to do any splicing. Better to take it to a shop that installs trailer hitches and have them do it.
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