Yes Fred you are right. Grounding is an issue with lighting. Parts are painted or powder coated. Housing, brackets, truck frame. It's up to us to be cognizant of that. The manufacturers/vendors have to protect the product on long sea journeys. Salt air, storage, etc. So that we receive a nice looking unrusted product. It's just the nature of the game with auto electrical which uses the metal and chassis as ground. As you know, most troubles are a ground problem. Seems silly but we have to take off the paint, mount the thing and then paint. Maybe add a wire here or there. Some use dielectric compounds.
