Truck Trailer Plug Test both 7 Round Blade & 4 Pin Circuit Fuse Light Tester (16687)


Regular price $15.00

Both a 7 Blade and 4 Pin Trailer plug Tester 

Have you ever been just about to leave to a job site or go on a vacation, only to hook up to your trailer to find that your lights are not working and have no idea what the problem is? Never will this happen again with this tester! This checks to see of the 12V power is running from your tow vehicle is reaching your trailer plug or if there is something wrong with the wiring.

Most of  Today's trucks have dedicated fuses for the trailer wire circuits, so until now, you really had no way to check and test fuses and trailer power, to confirm the truck is working as it should!

Easy to use
  1. Plug your tester into the tow vehicle's towing plug
  2. Operate vehicle's turn signals, lights and brakes
  3. When the power is present, the tester's green LED light will glow

I also have these trailer cords in other lengths and styles, CLICK HERE to see them

Need help sorting out the wire colors?  Click here for help!

Please contact us if you have wire questions, we un a full service trailer repair shop, so we re-wire trailers daily! And remember, you can not depend on wire colors alone, you should test your particular trailer wire system. we offer phone assistance, but can not be responsible for improper wiring done by the customer..

Trailer Connector RV Style 7-Way Blade with molded lead.

  • Pre-wired 7-Way Trailer Connector
  • length is including connector
  • Wire gauges:
    • 14 gauge - red, brown, green, and yellow
    • 12 gauge - Blue
    • 10 gauge - White and Black
      Wiring Code
      Molded Connector            
      Usual Trailer Wire
      White Wire Ground White Wire
      Red Wire Left Turn and Brake Yellow Wire
      Brown Wire Right Turn and Brake Green Wire
      Green Wire Tail Lights Brown Wire
      Blue Wire Brake Power Blue Wire
      Black Wire 12 volt (hot lead) Black Wire
      Yellow Wire Aux. -