Because if you reversed the polarity at the battery it would blow the fuse through which current flows to the drain.
Batteries are neither positive nor negative ground. It is the circuit itself that determines the common ground. For example: If I have two circuits, one needing 6vdc negative ground and the other needing 6vdc positive ground, the battery would be installed the same way in both circuits (positive terminal on the battery to the positive connection in the circuit, regardless of whether the circuit is positive or negative ground). The reason for labeling the ground as Positive or Negative has more to do with how the circuit is wired up, than the actual voltage source. The explanation for that is beyond the scope of this answer.
No. Setting any kind of battery on the ground has no effect on its electrical characteristics. Electrical energy is drawn from a battery only by things that are connected between the battery's positive and negative terminals. Think of this, new batteries are kept on metal shelves. Steel is a better conductor than concrete. So if you could "drain" a battery by setting it on something, a steel shelf would be more efficient.
check to see if your battery connections are correct. if you have a bad ground cable it could drain any battery quickly
The negative lead of the battery charger can be connected to either the battery negative terminal/post, the alternator case, or a known good engine or chassis ground. Note, if the lead is placed on a painted surface, high resistance will occur and the system will not charge.
Yes, if the relay was stuck it would drain the battery.
Any wire or other metal object which touches the positive (+) connection of the battery AND the negative (-) battery connection OR the metal bodywork will spark
there is a small box where the battery would be that you hook the positive to and you can just hook the negative to anything that would ground it
there may be a ground wire from the negative battery terminal that isn't making a connection
A short to ground somewhere in the electrical system.
Its not charging.
I owned a 1984 Toyota Trecel and it was a Negative Ground system. This means that the battery's negative terminal had a ground strap attached from the negative terminal to the car's metal frame. I've owned two 1975 Toyota celicas made for the United States and the batteries were also negative grounded. You would probably have to go back to the late 20s and 30s in the United States to find a positive grounded battery system. Old Ford Model A cars and trucks in the twenties for example were positive grounded battery systems.
No. That would short out and potentially cause a fire. The negative side will go to the frame or the body to ground.