If someone is towing different trailers with different tractors, doing it alone saves a lot of time. My problem was determining if a 2012 Dodge 1 ton or trailer was causing intermittent continuity issues. I've used simple warning lights for years, but with this tool I was able to determine that I had a trailer problem, and my second tractor, a 2002 Ford 350, also had tractor problems. It cost $145+ because my time is precious.
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