OK so this is what was going on....
Direct power to the sat Nav rearview
Direct power to nothing, also in the cab
Noise capacitor
Power to the redarc, power to second battery
Power to an isolation switch, in turn powering a 12v fridge plug in the rear
Direct power to the front, for spotlights.
Power to a kill switch for spotlights
Hmmm
The redarc was installed professionally, it can stay
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