Tuga,
As one of my friends on the forum likes to remind me - "All Newells are different!". On mine the positive cables do run direct to the inverter/charger, BUT the negative side is totally switched off by the coach battery switch. When it comes to shutting off power only one side disconnected is sufficient. Your mileage may vary.
Be very very careful if you decided to remove the battery cables. If I were going to do it that way I would remove the negative side. If you chose to remove the positive side be very carefully to be sure no tool you use can come into contact with chassis ground and that you control the cable completely once it is loose. Wrapping your tools in electrical tape could help if you turn too far. You will need to insulate the cable somehow. I saw the guys at Newell sticking the cable in a rubber glove and taping it up. And I suppose good advice is always if you don't feel completely confident about working with such high potential currents, get some help.
Let us know when the fuses arrive and how it goes. Russ
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