The area of concern:
Mystery one solved.
The green/black wire from the 12V battery block is the main ignition relay wire.
Mystery two:
There is only one main power wire from the DC-DC: White.
What else would the DC-DC wires be?
1) 5A black/red: Main start up power? Battery charging wire? This would only make sense if the battery could be isolated. Most alternator systems just vary the whole system voltage which the battery happens to be attached to.
2) Voltage sense wire.
3) amp sense wire.
4) HV supply. This must be the shielded HV wires.
5) Temperature sense wire.
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