first thing i would do is check the trailer wiring for a good ground and any breaks in the wiring. then check both ends of trailer/truck pigtail to make sure no loose wires and no dirt and a good tight fit in the plug ins you might check the light bulbs as well, you also need to check the voltage at the pigtail..if that is good go back under the cab to the plug for the pigtail where it comes out of the cab..if that is good go to ther fuse panel.(#29 I think). if ther is voltage there...it could be the relay or the wire...you'llhve to trace it out to see.
Try the tractor with a different trailer, the pig tail is most likely not connecting properly.
Very top is ABS, next two down are marker lights, next two down from that are flashers/turn signals, bottom is brake lights, center is ground.
An articulated lorry is a truck and trailer - a combination involving a tractor unit and a semi-trailer, known in the United States as a semi-trailer truck.
semi truck, or semi tractor trailer, and 18 wheeler.
Trailer is way more bigger than a semi-trailer. Common misconception between a trailer and a semi-trailer. Technically, a trailer has wheels in front and rear and is hitched to a pulling vehicle (car,truck,etc.) A semi- trailer only has wheels in the rear and is hitched to a pulling vehicle (car,truck,etc.)
Stop the truck, shift into reverse, let off the clutch. Or, if you have an automatic, you just push the button for reverse, then take your foot off the brake. As for maneuvering a trailer, turn the wheel to the left to turn the trailer right and vice versa. If you get a diecast model of a semi truck and trailer and maneuver the trailer while you back it up, it could give you a basic understanding of how it works.
Semi or Tractor Trailer-semi.
Semi truck trailer
13'6
A vehicle with 18 wheels is commonly known as a "semi-truck" or "tractor-trailer."
You call it a semi because it pulls a semi trailer.A semi is a type of trailer. A semi-trailer, as opposed to a full trailer, means it only has axles at the rear of the trailer and a full trailer has axles at the front and rear of the trailer. We call these in the UK "drags", as in wagon and drag, where the wagon that pulls the drag can carry a load on its own, whereas the semi-trailer truck, or tractor unit cannot carry anything without a trailer.
The word semi means half, or part.The tractor and trailer are two parts, hence semi truck and or trailer.