Fiddled around with battery cables a little, next thing I knew, no arcing

So you hooked the battery cables up the way they should go and now no more problems?

I had Neg to Neg, Pos to Pos before. (No I did NOT have things backwards) But the main thing, is that the arcing issue was solved, and that'* all that I was concerned with

So nothing changed it just started working. Interesting. Have you thought about being a faith healer?

Playing devils advocate here. I'm wondering about the 'level' of arcing OP is experiencing. Now, I know Carfixer007 and I have connected hundreds of batteries before and have experienced some arcing during connection. Though this is very common. Again, I wonder if the arcing the OP is experiencing is of a normal level, as opposed to arcing one would experience using a 12v battery to use for welding rods.

I think he had 12V to ground and either doesn't know it or is ashamed to admit it.

^ That is also a possibility.

I am NOT that stupid to have connected any cables/wires wrong. Doesn't matter now as the car starts and runs, all accessories work as they should

Since you do not know what you did to fix it kind of proves my point. You didn't know. That does not mean you are stupid.

Sometimes trial and error works quite well when solving a problem. Was checking things under the hood today, and decided to find out where that homemade mystery wire went.... It was connected to this 12V stud in the middle of the maxi fuse center. What it was for, I do not know, but it was a homemade wire not made by me. I removed it so as not to cause any more issues.