I just got my 1976 240d w115 rolling it was a basket case. It came in boxes. I can't get the Instrument lights to work. Fuse is good, so I pop out the speedo cluster and these wires(black) on a long banana clip are popping off can't tell what goes where?. The bulbs look good and all are out. These black wires have like a fiber glass core. I think it might be a ground fusable link?. After screwing around with these black wires I use to get the battery and brake warning lights to come on when I turned the key. Now I don't?. Thanks for the help.