How To Test Your Truck's Trailer Connectors

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“One-Man Testing” for Male and Female 7-Way Round Pin Tractor Trailer Plugs.

Features and Benefits:

Allows bypassing of troubled circuitry while on the road
Packaged with an extra jumper connector
Plugs into the vehicle side socket
LEDs indicate that each circuit is working
Eliminates guesswork
“Winged” grip for easy removal from electrical connector
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I'm a yard driver at Amazon and needed to know what the GL- Tail & GL-Mark was for. Thank you!

carlpeeples
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How do you use the jumper connector that comes along with this. A detailed video of this would be great!

cherylwillis