Bought one of the $10 7 pin testers to diagnose trailer brake problems on a 2017 F350. A cheap tester didn't help with 12v to the trailer, nor with the trailer brakes themselves. Due to the way vehicles have changed I needed a more sophisticated tester to make sure the truck wasn't the problem. It took me less than 5 minutes after receiving this item to determine that the trailer was the problem and the truck was throwing both 12v and trailer brake lights through the 7 pin. Very easy to use and perfectly imitates the trailer of the F350! Thanks!
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