Instructions for adding relays (home-brew, not a "kit") on my '88 K1500, hosted on another forum. Totally reversible if desired.
http://www.automotiveforums.com/vbul....php?t=1152614
Quote:
Originally Posted by Half-Inch Stud
Real Sealed Beams have ZERO corrosion or reflector aging; they are sealed.
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You'd think so. Not actually true.
Plenty of sealed-beams get cloudy reflectors due to Thermionic Emission--the filament that glows white-hot, also throws off tungsten metal particles just like the active elements inside a hot vacuum tube--triodes, pentodes, etc.
The cloud of metal vapor deposits unevenly onto the reflector and reduces the reflectivity over time.
Many "sealed beam" headlights get bulls-eye cracks just like windshields from road debris. That allows water-vapor to get inside. I've seen one "sealed-beam" headlight with liquid water inside, and it still lit up. Vehicle owner wouldn't pay to replace it.
Attached a photo of a Wagner sealed-beam "Halogen" headlight where the reflector is so pitted that all the light you see on the reflector is coming from the filament inside, not the camera flash.