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Why on one side of trailer all lights work and other side only brake light?
Wiki User
∙ 12y ago
- Running light bulb burnt out (could be a dual filament bulb or separate bulb) and the lower watt bulb is bad.
- Fuse Issue on vehicle
- Trailer wiring somewhere in harness all the way back to bulb
- Wiring on vehicle
Most likely the bulb or fuse.
Wiki User
∙ 12y ago
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You rewired your trailer and you have all of the lights but no brake lights?
Your trailer tailights are dual-filament, with one being the running lights and the other the brake lights. You need a separate power source from your towing vehicle's brake lights to power them. The easiest way to do this is go to U-Haul and but a set of their trailer towing taillight bulbs for your towing vehicle. The bulbs replace your standard tail/brake light bulbs, and they have two wires coming out of the base of the bulb. One of the wires connects to your trailer's running lights, and the other one connects to your trailer's brake light circuit. I'm trusting that when you re-wired your trailer, you ran two wires from the taillight socket, one for the running lights and one for the brake lights. In some trailers, the brake light circuit also doubles as your turn signals. Good Luck.
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If the Avalanche came with the factory trailering package, the trailer lights are separately fused from the other truck lights. Check your fuse panel layout for a 10-amp fuse for left side and a separate fuse for right side turn signal/brake light on the trailer.
Why would you have no brake lights but all the other lights work?
Blown fuse or bad brake light switch?
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Trailer Lights Work on Other Vehicles but Not MineIF the lights [tail, turn, and brake] are working on your vehicle, AND the trailer lights will work on some other vehicle, that confirms:That the problem is NOT in your vehicle's wiring system.That the problem is either in the trailer wiring, OR is caused by the IMPROPER connection of the connector plug wires to the wiring of your vehicle.It is critical that the connector plugs [on the vehicle and the trailer] are properly connected to the correct wires.The fact that NONE of the lights work when connected to your truck suggests that the defect is related to the GROUND wireas that is the only wire common to all the different light circuits.
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Check your fuses and look for a dead-short on the tail light wire (probably brown).
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