Hello,

The dash lights of the instrument panel are not responding on the 76 300D. I've removed the cluster, checked the bulbs and the dimmer control. That and the circuit board for the instruments seems to be okay. I checked resistance through the rheostat and through the contacts on the circuit board. I also checked the resistance on what I thought to be the right points in the multi-pin connector that plugs into the back on the cluster. I got a reading of some resistance, but I don't know what it is supposed to be.
I wonder if the rotary light switch is not telling the cluster lights to come on. I don't know how to check for this, other than checking for voltage in the same pin holes on the multi-pin connector that I checked for resistance. I got nothing when I did that, but I don't know much about electronics.

Any help is appreciated.

Also a seperate related issue. The temp gauge bounces wildly a lot of the time now. There are two sensors plugged into the head on the glow plug side of the engine. I'm guessing it is the rearward sensor since uplugging the one in front, (that is also connected to glow plug #1) has no effect. Should I just replace the temp sensor?

__________________
63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6