Greetings Tom!
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It appeared that, after the bulbs were installed, the assembly was sprayed with some sort of clear lacquer before the lense was installed. Does anyone know what the spray was?
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This is a guess, but I would suspect that the coating that you are seeing may very well be PlastiCoat. If the bases were installed prior to the final finishing, which I suspect that they may well have been, it would almost be a natural to have PlastiCoat on the exposed surfaces. With the protection afforded by the lenses, the PlastiCoat would likely survive unscathed for many years if that is the coating.
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Since I am currently servicing the turn signals, backup, and marker lights, what do you recommend for "care and feeding" of the electrical contacts?
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Dr. Jonhnson, an electrical engineer on another list to which I subscribe, recommends dielectric grease on the electrical contacts as well as ground contacts. He also suggests aluminum conductor grease on the ground contacts that touch the skin of the trailer.
I haven't disassembled the lights on my trailer, but I do use the the dielectric grease that Dr. Johnson suggested and it has made changing bulbs much easier.
Good luck with your project!
Kevin