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In-line circuit tester
Works with turn signals, taillights, brake lights
Simply plug into vehicle's 4-way flat towing plug
Save time debugging trailer light problems with this in-line circuit tester. Works with turn signals, taillights, and brake lights. Simply plug tester into vehicle's 4-way flat towing plug. Operate the vehicle's signals, and when power is present, that circuit's green light will glow.
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