• 12N 7 Pin car and trailer tester for testing ISO1724 /12N 7pin circuits
• LED indicators show any faults on the towbar or trailer lighting circuits
• Requires 1 x 9V PP3 battery (not included) for testing trailer lighting
• Note: Not suitable for use with LED trailer lights
• Towbar testing requires ignition to be switched on and each function activated in turn
• Indicators will show green when function is tested and correctly wired, or red if a fault is present

Tow Bar Testing

• Plug the tester (“Towbar Check” connection) into the 7 pin towing socket
• Switch on the ignition and test each lighting function in turn
• LED indicators will show Red when the function tested is correctly wired

Trailer Testing

• Not suitable for use with LED trailer lights
• Insert a PP9 – 9V battery (not included) observing correct polarity
• Insert the 7 pin trailer plug into the tester (“Trailer Check” connection)
• Press the “Trailer Check” test button on the side of the tester
• LED indicators will show Red when the function tested is correctly wired
• If the LEDs do not light up check the internal battery.
• If individual LEDs still do not light up, check the plug wiring against ISO1724 – some lighting circuits may not be connected in all installations.
• Finally, make further checks of bulbs and contacts if necessary