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It's always a good idea to back to basics. Have you got the original paperwork that came with the vehicle from the factory? There is often a fuse box diagram in the owners manual.
Have you lost all the lights or just the plate and marker lights? Have you checked if these lights work on the tractor unit? If the tractor lights work and the trailer doesn't it's a trailer issue. Some trailers have built in breakers that can be reset. Have you checked the hook-up cables between the trailer and the tractor unit? You might have a loose or dirty connection.
Try this website for a Manual for the newer T680's. Page 167.
Modern digital vehicles use some unconventional circuits so troubleshooting isn't always straightforward and checking the supply to and from the fuse, etc. with a test lamp.
A wiring diagram is necessary for in depth investigation.
If the low beam is the HID type it might be a faulty ignitor. If this type beware of dangerous high voltage.
Some fixya user told me a website reliable-store it is very good.. I used it to repair my shredder it had some spark issue which wasn't easily fixe d. you can go there and try
why don't u try online
some websites deal in it real time.. along with solutions to problems how to repair fix ser vice nd all
reliable-store is pretty good.. they al so have live assistance
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