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Snicko, I'm an electrician and have done a bit of this wiring on my own gear.
The advice is good what is above, please be really carefull of 240volt in your system. I assume you have an inverter 12vdc to 240vac.
And there is an inlet plug, that one is easy - make sure the lead is not plugged in.
As for the inverter
If it has a power point socket on the outside - unplug the lead. Then disconnect all 12vdc from it and make safe.
That 240volt stuff is leathal and you can not see it, so be very carefull when de-wiring components.
Allway check twice!!!
Good luck with it
Macca