Wesbar Circuit Testers

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The Wesbar Circuit Testers are a must-have tool in your trailer for checking the continuity of electrical circuits. These are 4-way, 5-way and 7-way testers that come with LED display for monitoring the completed circuit for the running lights. Testers come with either dust cap or trailer emulator.

The tester just has to be plugged in to any car connector to test running lights, left and right turn signals, auxiliary and electric brake, and battery charge. You can also install a brake controller when there is no actual trailer with the help of the trailer emulator.

  • 4-way, 5-way and 7-way testers
  • LED display, dust cap, trailer emulator
  • Tests running lights, left and right turn signals, auxiliary and electric brake, and battery charge


Manf. Part #: 767941

  • Type: 4-way tester with led display
  • Checks running lights, left and right turn signals

Manf. Part #: 767942

  • Type: 5-way tester with led display and dust cap
  • Tests running lights, left and right turn signals, and auxiliary brake

Manf. Part #: 767943

  • Type: 7-way blade tester and trailer emulator with led display
  • Tests running lights, left & right turn signals, auxiliary & electric brake and battery charge

Please be aware that all products have a production or warehouse lead time. This is the number of business days (typically not including the day the product was ordered) that must pass before the item begins the shipping process. Please see the "Ships: In" information located within the main product description to the right of the product image and below the ADD TO CART button for that particular product's "Ships: In" timeframe.

IMPORTANT: Please note that these timeframes are estimates only based on the latest information provided to us by the manufacturer/supplier. Delays in both material, production and shipping timeframes by manufacturers can vary without advanced notice and while we do our best to keep "Ships: In" timeframes up to date we may not always be able to do so due to a variety of factors.

If a product is needed by a specific date we strongly recommend you reach out to our Sales team (1-800-869-1686) to verify shipping timeframes.

Canadian orders please add an additional 14 business days for processing and shipping. Alaska and Hawaii orders please add 1 additional warehouse processing day.

Click here to see our Standard Shipping Policy

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