wire/lamp identity??

RedFish said
There was also a separate bulb socket for seatbelt warning added. I don't know exact year it happened. 73 has it. I think the metal inst' housing was used to ground it so it needed only 1 wire, otherwise there would be 2 wires.
I don't recall blue with white tracer being fused beyond the fusible link. If that's the case here a lamp wire can stop the whole show. Ignition and charging system are also on blue w/white.

Thanks RedFish.... I am going to have to chase down that blue/w white trace. Here is a picture of the bulb in question showing the wires. So I was thinking of just not using it but I need to be sure it does not interfere with something else as you elude to. You can aslso notice the amp meter black and red solder spliced together as per that Mad wiring instructions.