A few weeks ago, the climate control lights and shift indicator went out on our w123 85 300D. Today, I finally got to it.

Previously, I had jumpered the rheostat - no problem with instrument cluster lights.

But, now I am stumped. I have no power to the christmastree-like light string at the panel and the spider at the firewall. But, I do have power to the shift light bulb, which according to fusebox diagram is on the same fuse.

I checked fuses, even switched them around, but it seems climate control is shared with shift indicator and several other things. Everything else seems to be working. A blue wire feeds the Climate control/spider circuit, but it disappears through down near the firewall, presumably going to fuses or thereabouts.

I don't have a wiring diagram. Can anyone tell me where that blue wire goes?

Some of the bulbs were bad, but surely they are not in series? No, no power on circuit anyway.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5