Trailer Brake Controllers: Proportional vs Time-Delay
One senses how hard you are stopping. The other applies a preset ramp regardless. What that difference does at a hard stop, and which vehicles already have one.
4-Pin vs 7-Pin Trailer Wiring: What the Extra Pins Carry
Four pins carry lights. The extra three carry trailer brakes, reverse and a charge line, which is why a braked trailer cannot use a four-pin connector.
Brake Controller Wiring: Plug-and-Play vs Aftermarket
If the harness plugs into an existing connector, it is an owner job. If it involves the brake switch or a battery lead, it is brake-circuit work and it is a shop.
Trailer Breakaway Systems: The Battery Nobody Tests
A breakaway system is a battery, a switch and a cable, and the battery is the part that fails silently. How to test yours, and where the cable must not be clipped.