Wondering if you folks would help me understand the electrical mods needed to operate certain devices. Ive never worked on dc anything btw.
Start with this: On most vehicles the whole chassis is connected to the negative terminal of the battery, and the positive side supplies the juice to the item, via switches or whatever. The metallic parts of the structure are used as part of the electric circuit. That has been the case for ages. This is called negative ground, or negative earth in parts of the British Commonwealth. Some British cars, back when, ran a positive ground system (My 1961 Austin Mini 850 and my equally old Sunbeam Rapier were both positive ground I think, but I could be wrong on one of them - it was a while ago.) A few large North American trucks did the same for some unknown (to me) reason.
So, what relevance has this to you and your VStrom. This sophisticated modern conveyance has an aluminum alloy frame, and components of various metallic alloys. Well, not titanium and expensive stuff like that, but you still need to know that it's not all steel.
The negative part of the circuitry in our beloved wees, vees, glees and whatever the new 1000 is called is done through wires, not the chassis or other components. These are not the good old days. You pass a current through zinc and steel, or aluminum and steel, or magnesium and anything else, or any two dissimilar metals, add moisture, some dirt and maybe some road salt, and one of the metals preferentially corrodes. There are rules and tables as to which one rots first. Neat stuff, actually. (I've seen bumpers on late '70s Oldsmobiles fall off due to this galvanic action. You don't even have to pass a current through some such set-ups - they create their own current. Hey, this is how batteries work.)
Our wonderful modern machines avoid, to a great extent, such problems by using specific ground wires for everything electrical. (Well, except for spark plugs and maybe a few other things).
The gist of this: Don't use the frame, engine or anything else as part of the circuit, even if your grandpa did so on his Desoto. You will probably run everything positive from a fuse block that you install, which in turn is connected to the battery positive post. You need to run all the negative wires back, ultimately, to the battery negative post to complete the circuit.
I'm not sure how others have done this (if they've done this at all). I will tell you later how I have done it (gotta go bed right now). You could run the whole mass of negative cables back to the battery post (a real mess), or to some negative terminal already in place, or to one you install somewhere. I'm interested in seeing what others have done. Let's see!