Tuga,
Turn off the coach/house batteries at the disconnect switch which is my coach is located in the compartment with the house batteries. As a level of assurance to be sure the switch worked try to turn on some 12volt lights and make sure they don't come on. The little on/off switch on the inverter/charger is not involved and may be left in the on or off position. I still use extreme caution when working on conductors that near the batteries. Just proceed making sure you never let the positive cable or any tools touching it come in contact with any part of the body. Twelve volts of course will not shock you, but you could sustain a flash burn if you do not isolate the batteries and do not make any mistakes that short positive to negative. You could remove the positive cables at the batteries themselves, but this is not without risk either. Just use the big disconnect switch, check that it worked, and proceed carefully. You should be fine. Russ
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