Yes. This opens the throttles a little more when engine is running than when the key is off. It was used because the idle settings for reducing emissions made the combustion chamber a little hotter at idle and required a little more throttle opening at idle. Having the throttles close more when the key was off prevents run-on.
That connector seems unique to the engine package. I now understand what the mystery is and why you think the harness may be for a different engine.
Looks like one is reverse lights/starter safety while the other is wiper motor.
Your ammeter is missing its needle ??