Hello, I am just about to upgrade my Ford Tourneo Custom (Bus) a little direction camping light. After a 100 AH additional battery has been installed and the heater is to be connected there, I want to install or connect the following: – approx. 4 x 12 volt sockets a max. 20A with at least 2.5 mm2 cables – 1 x double USB connection with at least 2.5A – Convert the existing interior lights from B-pillar in the roof to LED and separate from the on-board electronics and new with the Stro m the additional battery (3 ceiling lights on/off with toggle switch on/off incl. 2 reading lights, in total per luminaire probably 3.5W-4.5W – so max. 13,5W / 1,1 A if all are on) – On/off switch for lighting – On/off switch for 12 volt electronics of additional battery on lighting/12 volt sockets – A simple voltmeter, also digital (or is also an amperemeter easy to install?) …so everything clear!!!! Now to the questions: The 12 volt sockets (4 mm2 cables) sol Here I introduce that a power cable (which thickness?) is distributed directly from the additional battery to a fuse distributor 4-fold (of course, 12 volts socket is protected with a 20A each). Where do I connect the switch and how much amperes must the switch withstand? The luminaires should also be connected to the battery with a fuse distributor. Here a fuse of 2.5A will probably be available for each individual lamp. How much amperes must the switch have? – Which fuses should I use (the small or normal flat fuses)? – Which switches to switch on/off the 12 volt sockets, how much amperes? – Which fuse distributors or possibly a fuse machine? – Only one cable from the battery and then distribute in 2 circuits with the lights and sockets or both circuits directly on the battery (each socket or lamp is individually secured) – protection of everything with a “big” fuse? I also gladly accept tips regarding the hardware incl. links!!!! An acquaintance will make the installation, because he probably has an idea and professionally converts trucks or small vans to cooling systems. Unfortunately, he does not always stand by me personally with advice and I would like to know in advance to be able to buy the hardware.