If there is a light on your truck,it has to work,that includes the extra chicken lights.In most states it's a 35 dollar fine for every light that doesn't burn
The regulation is quoted below. Note that there is a difference between chicken lights (auxilary lamps, additional lamps, lamps not required by the regulation) and "all lamps required by this subpart."
In other words, chicken lights do not have to work. I am open to correction on this since we have 94 chicken lights on our truck. But since they are not required lights, I won't worry much if one goes out. If you or someone else can cite the reg that says all lights must work, and not just required lights, I'm all ears.
It is significant that the regulation itself cautions about misconstruing it to mean that auxilary lamps should be capable of working at all times. Clearly, an auxiliary or additional lamp is not required to work at all times.
The only lamps that are required to operate at all times are "all lamps required by this subpart." "This subpart" refers to Subpart B of Part 393. You can view the subparts here.
Again, I am open to correction, but unless someone comes up with a regulation that overrides this one, I will remain confident in my opinion that chicken lights do not need to work at all times.
§393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.
(a) All lamps required by this subpart shall be capable of being operated at all times. This paragraph shall not be construed to require that any auxiliary or additional lamp be capable of operating at all times.
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