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Hopkins 48133 Trailer LED Test 4 Flat Trailer Side (24")Trailer Wiring Codes
Helping solve the unknown. LED lights illuminate when the trailer is connected to the tow vehicle verifying that each function is working properly saving time during setup and diagnosis. The connector also has protruding wings to help with disconnecting. Upgrade any standard 4 flat to LED test!
LED Test Connectors for Trailers video: