Getting to Know your Wiring Tester

Posted: March 28, 2014 in Boats, Parts and Accessories, Shopping, Trailers, Vehicles
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Although they do not have any self-propulsion system, trailers still need proper controls from the main towing vehicle. Transportation Department guidelines mandate that the trailer has electrical connections with the tow vehicle such as links for brakes and stop lights. Things may get scary when they act up on the road, but you can still check if the system works by using a wiring tester.

Wiring testers are designed to check all wires for an active circuit. The functions of each vary depending on the number of wires and systems the trailer has; some can be mated with more complicated set ups.

The wiring for most trailers out on the market today vary from four-way to seven-way plugs. The four-way flat plug tester is for trailers with turn signal and side marker lights, while five-way flat plugs add a ground wire to accommodate either backup lights or auxiliary power. Six-way rectangular or round plugs have linkages for turn signal lights, side marker lights, and taillights, and the seven-way round plug has the same functions as the six-way but will add a link for the auxiliary power or backup light.

Testing all circuits takes a lot of time. You have to check linkages between the towing vehicle and the trailer. If the problem with the circuits doesn’t originate from the tow vehicle, due diligence can discover which circuit in the trailer is dead.



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