Pazon wiring for my BSA 441.

I'm wiring the Pazon sure-fire to my 68 BSA 441 Shooting Star & it's all clear except my bike with stock harness as far as I know has two female connectors going to the - on the coil, one with two white wires I can trace back to the ignition switch but it also has another white wire I can not find continuity to anywhere. Does anyone know what this might be for?? All my wiring diagrams show only white wires from the switch to that side of the coil.. Why would another white wire connect there?? Thanks.

Mystery solved, the wire went to a unused idiot light socket wrapped up and covered in the headlight shell.. Must have been for some other model..