Need help with wiring on LGB Genesis front light board..... ref. pics provided.

I got a new front lightboard for my Genesis, after the old one burnt out. I need help determining what wire #4 on the 4-pin plug does. The pcb traces appear to have some sort of shunt between pins 3, 4, and the headlight trace. Any assistance would be appreciated. Ultimately, the wiring will be connected to a QSI Magnum board through additional resistors in series.
Thanks,
JimC.

Larger view of traces.

Answered on MLS and LSC.

Greg