"Hopkins Towing Solutions LED Series vehicle-to-trailer adapter incorporates built-in troubleshooting. If the trailer lights are not functioning correctly, the adapters LED lighting will indicate whether its a trailer- or vehicle-side problem. Plug-In Simple takes the guesswork out of vehicle-to-trailer wiring. Connector Type 7 RV blade to 4 flat w/LED test light, Plug Type Plug-in LED adapter. Functions tested Right turn and brake, left turn and brake"
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