I have a 1982 300D. I swapped out speedometers over the weekend, and now my dash lights and climate control lights don't work. There is a circular pin connector on the back of the instrument cluster. It looks like I should have 12 volts on the pin that feeds the 3 dash lights, however, I have zero voltage. The bulbs are good, and, when I apply 12 volts directly to the cluster, two of the three lights come on. These are the two that feed the top of the cluster. I can't get the third one, which illuminates the gauges on the left cluster to light. I checked all of my fuses. Any ideas?