Could be a bad rheostat. Try moving it back and forth a bit, see if that helps. If that doesn't work, pull it out and disconnect it. There are three wires in the connector, jumper between the two that aren't black. If that makes the lights work your rheostat is bad.
No instrument lighting
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Ok! Dimmer was certainly part of the issue. I applied some contact cleaner and rolled it end to end a few times.
This brought back ARC backlights, "cigar" lighter and ash tray (according to manual
) lights, and the backlights on the buttons surrounding the dash. They all dim appropriately as well!
What still isn't working:
Dash cluster has no backlighting. I replaced this in the last few months, so it's possible I did something wrong on assembly, although ALL other functions work flawlessly. It seem unlikely that every bulb is bad, but I suppose it IS possible.
Clock has no voltage whatsoever. No backlight, no time. Again, both tested good on a bench yesterday.
![1656649]()
This brought back ARC backlights, "cigar" lighter and ash tray (according to manual
) lights, and the backlights on the buttons surrounding the dash. They all dim appropriately as well!What still isn't working:
Dash cluster has no backlighting. I replaced this in the last few months, so it's possible I did something wrong on assembly, although ALL other functions work flawlessly. It seem unlikely that every bulb is bad, but I suppose it IS possible.
Clock has no voltage whatsoever. No backlight, no time. Again, both tested good on a bench yesterday.
Looking at the factory manual, it looks like I was mistaken. I thought the clock power circuit was behind the rheostat, but it looks like I'm wrong.
C7 = clock
N16 = Tacymetric control unit (does my car have this?)
N19 = performance gauge control (I'm pretty sure my car does NOT have this)
It does appear that the clock circuit is isolated. It also appears it draws all connections through G111 ("connector for dashboard instruments wiring"). Is this located in the fuse box access? Seems like a good place to start (along with the fusebox grounds, which I also assume are in there).
I THINK I've got a handle on what these wires to the connector do, but please help me out:
SB (Pink/White) = switch +12v
N (Black) = ground
G (Yellow) = ?
RN = Red/Black = constant +12v
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