If your boat trailer lights malfunction and you’ve checked the wiring and replaced the bulbs without results, try checking the light system’s grounding. Many boat dealers and garages that install ...

This is the primary cause of trailer-light problems. Symptoms include flickering, fast-blinking, dimness, intermittent operation (often when a trailer ball is used for a ground), and complete failure.

Replacing a worn-out four-wire trailer plug is a quick and easy job. Step 1: Use a pair of diagonal pliers or a wire cutters to remove the existing plug from the trailer. Step 2: Take the old plug end ...