This Ultra-Tow 4-Way Flat Circuit Tester lets you quickly and easily test and troubleshoot power supply to trailer turn signals, tail lights and brake lights.
FEATURES
No batteries required
Plugs into 4-way flat tow plug
Indicates if tow circuit is properly configured
REVIEWS
****** - Verified Buyer
4.5
Gave me all the info i needed.. Plugged it in and showed me all possible signals and if it worked correctly on my wiring. Thanks!
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