biackbenz

I have the center guage cluster out of car. I found a circuit board for a light lying on the floor behind the radio. It has three prongs on it which makes me believe it is the low fuel warning light. No bulb in it. What type of bulb do I need?

There is an empty hole on the just above the clock. The red window does not have any writing on it. Is this supposed to be empty?

I might as well replace all the 39 year old bulbs. I can't read any of the numbers on them. Are they all the same bulb? Five of them are for illuminating the gauges, one is for low fuel and one is for fasten seat belts.

The light at the top of the cluster that shines down on the heater controls does not work. Is this a special bulb?

Jeffs82c3

Could be the light for the seat belt ( above the clock ) You should buy the manual for your car...

caskiguy

Go to zip-corvette.com look up dash console bulbs for a 1978. You'll fix it, not expensive for a complete interior set. The speed/tach bulbs are not the easiest to get to but it can be done.

SwampeastMike

Yes, that is certainly the low fuel warning circuit/lamp. As goes for ALL of the indicator/warning lamps it uses trade #194.

Yes, that indicator slot is empty.

The five general illumination lamps are trade #192. Again, the indicator lamps are trade #194.

Yes that IS a special bulb. It is trade #558. It is special because the tip is actually a concentrating lens. That "lantern" assembly as it is called is perhaps the most over-engineered and under-performing element of the 78+ interior. Even with a proper and new bulb it does a poor job of lighting the HVAC panel.

Mine is currently out of the car and I'm following advice read in this forum. Such advice is to open the light path.

This pic is looking through the newly expanded path.





While I may have gone too far here's a photo of the metal shield just below the lamp housing. Originally the hole was significantly smaller and off center in a pressed "bubble" in the metal. In mine the hole in that "bubble" was not well placed and I enlarged it to the entire "bubble" size.




I also drilled and filed the inner hole to enlarge it slightly and make it more rectangular. Then I filed the final aperture to enlarge is slightly.