The Curt Manufacturing 57676 adapter converts a 7‑way round trailer connector to a 4‑way flat plug and features built-in test lamps. This design helps you quickly verify signal and brake light functions without a separate tester, simplifying your wiring checks and troubleshooting.
Converts a 7-way round trailer socket to a 4-way flat plug
Integrated test lamps for tail lights, turn signals, and brakes
No external tester needed — test wiring right on the adapter
Built for rugged durability and reliable performance
