If you had problems with one and want to keep the rest I’d suggest just completely rewiring the rest of them before you have problems. The old W9 I bought had a bunch of lights on it and the former owner was not good at installing lights. I ended up cutting out his old hack job and doing everything correctly.
I like to see lots of chicken lights...on somebody else's truck. Our mechanic hates them. He'll put some extra tail lights and turn signals on a trailer but that's all.
It would be pretty hard to argue a light that’s not even required to be there is required to work. I’ve never even been asked to turn my chicken lights on during an inspection. FMCSA guidance also back up what I posted.
My old FLD. My old W9. This thing was a wiring disaster thanks to the old owner. T800 company truck I drove for my old boss. Our shop did everything right and never had any trouble with the lights on this one. And the current truck with nothing extra except the visor lights. I have a desire to park it and walk away from it for a few days so I’m keeping it pretty simple. I did swap out the trailer lights for the high dollar TruckLite mirror lights though.
Actually i have never been either. Headlights, turn, stop , and brake lights. Of course marker lights also. Never asked to light up backup lights either.
And yet every time I ask someone to provide state rules to support this, no one can. As there is no federal requirement for non-required lights to work. The guy who brought this up simply cannot be put OOS as per CVSA rules. The most that can happen is a specific state law, but again no one has ever been able to show me one.
Variety or reasons why one would like all the Chicken lights. Some of those reason are as basic as they look cool while others can be for safety reasons. For me, they look cool and honestly provide a better view for me while driving at night by reducing the glare from oncoming headlights....it might just be in my head though.
Yet we had some dip#### mechanic at the Ford dealer fail one of our F550 service trucks during our yearly CVI because an interior light in one of the toolbox cabinets didn't work.