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Answer :
Final answer:
The likely cause of the brake lights remaining ON in a parked tractor trailer is that the trailer hand valve is not fully released, indicating that the brakes are still engaged. Other options like leaving the ignition ON may contribute but are less direct. It’s important to check the hand valve to ensure it’s fully released to resolve the issue.
Explanation:
Understanding the Brake Light Issue in Tractor Trailers
When a tractor trailer is parked and the brake lights on the rear remain ON, several factors could contribute to this issue. Let's analyze the provided options:
- A. The ignition switch was left ON: This could potentially cause all electrical components, including the brake lights, to remain engaged if the ignition circuit allows power to flow continuously.
- B. The parking brake is set: When the parking brake is engaged, it is not typically the direct cause of the brake lights being ON unless there is a malfunction in the system.
- C. A fuse is blown: A blown fuse would usually disrupt power to a component, likely turning off lights rather than keeping them ON.
- D. The trailer hand valve is not fully released: This could keep the brake lights ON because the trailer's braking system may still sense that the brakes are engaged, triggering the lights.
Among these options, the most plausible cause of the brake lights remaining ON when parked is option D—if the trailer hand valve is not fully released, it may indicate to the electronic system that the brakes are applied, which leads to the brake lights remaining illuminated.
Learn more about Brake Lights in Vehicles here:
https://brainly.com/question/28939437
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