Possible causes: Burnt out light bulb causing a break in the system; corrosion in harness, light plug or pigtail; ground problem; hydraulic lock from too much dielectric grease; bad spot in wiring ...

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 th… ...

The trailer dealership won't let you leave until the lights work. And the trailer plug on the back of your truck doesn't remotely match ... you need only three wires to the trailer plus a ground wire.

Q:I am having a problem troubleshooting the trailer light plug on a 2002 Chevy Silverado. I get no power there. I've checked all the fuses and they're good. I expect it's a simple grounding ...

SUZCO SUZCO 25 Foot 4 Wire 4-Flat Trailer Light Wiring Harness Extension Kit, 4-Way Plug 4 Pin Male & Female Extension Connector & Wishbone-Style with 18 Gauge White Ground Wire with SAE J1128 $9 ...

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 ...

QUESTION: Every once in a while, the lights on my trailer go on and off while I’m driving down the road. The wires seem to have good connections. What could cause this?ANSWER: Chances are the ...