All you have to do is connect the small clamps to the relay and connect the battery clamps to the battery. This little tester actually figures out how the relay is connected and then runs the tests. I have no idea how it's done, but the person who came up with this must be a genius! I would love to meet this guy! I've tried this on many different relays and it works great. I've even tried tricking him by messing around with the insides of two relays, but he always identifies good and bad relays. This is the perfect tool! Lisle has a wide range of quality instruments but I think this one is the best! You must buy one!
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