Niagara 4-8-4 wiring

[Hardracer]

Hi all,

I recently purchased a used Niagara 4-8-4. It wouldn't run and I discovered a wire from one of the two pick-ups in the tender had broken off.

My question is this, does anyone have a wiring diagram for this particular loco. The wire is the orange wire from the tender pick up. I think I know where it needs to go but I want to make sure.

Cheers from Australia.