The truck's engine does not produce electricity, there are two possibilities.
The first is that the electronic regulator is broken, and the second is that the generator is broken. Other than the two trucks' circuits needing to be checked, no technology is required. to solve these two problems. The electronic regulator must be replaced. If it is new, have the generator repaired by a professional.
Note: A broken alternator can be repaired, but now 4S workshop is too busy to repair it alone. You need to go to a place that specializes in repairing automobile alternators. Car generators are generally not easy to break, so good maintenance habits should be developed after the car has passed the warranty period, the generator, engine and starting systems should be regularly maintained.