Savings. Shopping.Get Checkmate
Plug this easy-to-use trailer light tester into the 4-flat connector of your tow vehicle and the LEDs light up to confirm the wiring connections. Test your right, left, tail and brake light wiring all with one handy light tester.
Save on Four-Way Trailer Light Tester with a Harbor Freight discount code
Checkmate is a savings app with over one million users that have saved $$$ on brands like Harbor Freight.
The Checkmate extension automatically applies Harbor Freight discount codes, Harbor Freight coupons and more to give you discounts on products like Four-Way Trailer Light Tester.
Checkmate users have also been loving these products from Harbor Freight.
Users have been saving products like this to their collections.
