7 Blade 4 Pin Vehicle Plug Tester
Features:
Plug tester into tow vehicle's towing plug.
Operate vehicle's turn signals, lights and brake.
Easy to use.
When power is present, the tester's green LED will glow.
Use tester to check if 12V power from tow vehicle is
reaching the trailer's tow plug.
Tester also indicates if the vehicle's tow circuit is
properly configured.
Note: On 4-way flat plugs only the LT, TM and RT LED's will
function.
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 LED's are dim or flicker, check for loose or corroded
ground wire.
To test the tester, use 12V battery charger to determine if LED's power up.