Hi. Got a 70 Challenger. I can't see my speedo/gauges at night. The 3 lights work, but are very dim. They dimmer switch is all the way up. I can dim them to completely off with the switch, so does that mean the switch is OK? The bulbs are #1893 incandescent. Is there some kind of reflector inside the light bar?Also, what is the blue light in the attached photo? It doesn't go on with the other 3 lights? Thanks a lot.
Question: I can dim them to completely off with the switch, so does that mean the switch is OK?
Answer: The
dimmer switch may be defective and not supplying full voltage to the light bar bulbs even if it allows you to adjust them from dim to OFF.
Question: Is there some kind of reflector inside the light bar?
Answer: Yes, the bulb is reflecting on the interior silver-painted surface and light shines out through the blue-green plastic lenses.
Question: What is the blue light in the attached photo?
Answer: Yes, as
marks ebody replied, that extra bulb is part of the A01 - Challenger Light Group. You should see the other lights listed in the salesman's pocket guide list below on your car.
This
LINK has a lot of info on the 1970 Challenger instrument cluster light bars.