Use this tester to check if 12V power from the tow vehicle is reaching the trailer’s tow plug. This tester also indicates if the vehicle’s tow circuit is properly configured.
- Easy and quick to test trailer circuits on most trucks.
- Heavy duty nylon housing.
- Bright LED indicator lights.
- Tests 6 separate trailer light functions: turn, brake, tail, stop, reverse and 12V.
- Works with both the common 7 way AND 4 pin trailer plug used on most SUV’s, trucks, boats, trailers and RV’s.
- Tester can check all your trailer light circuits on your vehicle.
- Confirm you have the 12 volt power supply (often needed to charge camper batteries or operate interior lights on cargo trailers) which often blow fuses.
- Also checks your truck electric brake controller.
- If the LED lights light up on this plug, you know it is not the vehicle.
- Easy To Use
- Plug tester into tow vehicle’s towing plug
- Operate vehicle’s turn signals, lights and breaks
- When power is present, the tester’s green LED will glow.
- Tester Key:
- LT – Left Turn Signal / Left Brake Light
- TM – Tail / Marker Lights
- RT – Right Turn Signal / Right Brake Light
- 12V – Power to Trailer
- BK – Electric Brakes
- BU – Back Up or Auxiliary
- Tips:
- If LEDs are dim or flicker, check for loose or corroded ground wire.
- To test the tester, use 12V battery charger to determine if LEDs power up.