Battery not included. Test the Trailer Without the Truck! Tests 7-way round pin trailer-side harnesses. Connection Type: 7-Way Round Pin. Overload Protection: Automatic Resetting Internal Breaker. Output: 10A @ 12V DC.
Innovative Products Heavy Ranger MUTT 7-Way Round Pin Trailer Light Tester 9102
7-Way Round Pin Trailer Circuit Plug Tester #7865L Trailer Tractor Light Tester
