Our safety department keep flagging this truck for not have the blue travel lights working and for the life of me I can't figure out why it keeps burning out the lights. I have tried using different brands of light i installed a cheap dc motor controller on just the lighting circuit as well as a large voltage stabilizer like what is used on electric golf carts for 12v accessories. The lights I have had the best luck with are from amazon link below. But even these even these only last a few days or weeks. Is there a built in voltage regulator somewhere I am missing? This truck has a rats nest of a wiring from over the years and it just became my personal project to figure it out.

https://www.amazon.com/SXMA-5-5inch-Forklift-Safety-warning/dp/B01LMWCOBW/ref=sr_1_4?dchild=1&keywords=blue+led+work+lights&qid=1591069907&sr=8-4