Quote:
Originally Posted by Ken Cook
Are the Cibies made of glass or plastic?
Also with the 9003 bulbs, will I need a plug adapter or do they just plug in?
If I'm reading this correctly all I need are the Cibies and the 903 bulbs. However Heater63 posted ordering wiring and relays.
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They have a metal reflector with a glass lens. A normal H4/9003 bulb is the same wattage as a sealed beam so the stock wiring will work but has voltage drop at the bulb under load from the small wire gauge, distance traveled, and resistance in the switch contacts. They plug directly into the factory headlight plug, no adapter needed.
A relay harness isn't necessary, but it does make sure the bulbs are getting full voltage, which can make a huge difference in brightness. I did a relay harness in our shop's '79 C10 and even with the original sealed beams there was a huge difference in brightness. As the chart shows, it doesn't take much of a voltage drop to really hurt light output. A relay harness can be made so that there's no need to modify the original harness.
