Trailer: 2009 Escape 17B 2020 Toyota Highlander XLE
Posts: 17,136
I have the 7-pin tester and a 4-pin tester. When I had a problem on the tow vehicle, I learned that there was a faulty 4-pin connection under the vehicle, that led to the 7-pin. Cleaned up some corrosion and was back in business.
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What happens to the hole when the cheese is gone?
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