I don’t know if you can see it clearly in the picture, but this is actually an aftermarket windshield washer nozzle that has a light in it. I used to use the old 70s vintage Mopar top of fender indicators, but they have become rare as hens teeth and/or someone wants $1 million for them.
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For many years when I wire up my trailer connector, I put a fuse in, so if I lose my trailer lights, I don’t blow all my lights. Then, it’s not real difficult to feed the left and right rear light circuits up through the truck, and under the hood, to feed the indicators. So you’re looking at your own brake lights and turn signals when you step on the brakes. If they go out, you know you’ve blown the fuse.
it’s been a low priority, but I also want to get a scrap windshield washer reservoir and pump, and connect them to these nozzles with the push button on the dash. So if somebody’s in front of me, busting my chops, at least I can make them wet. Think “yellow dye.”
In reality, I can’t believe nobody makes a tiny nice looking top of fender indicator. If I was younger, I’d do it with my Chinese manufacturing guys. I bet we’d sell a million.