Forget those cheaper trailer plug testers when they don't apply a load to the controller. Without this, they don't show that the wiring and controls are working. This instrument applies this resistance so you can easily and accurately assess the condition of your wiring and controller. I can't praise this tool enough after spending hours looking at cheap alternatives which leads me to believe there is something wrong with my new controller setup. I wish I had invested in this tool sooner. Lesson learned.
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