1) Don't let them touch they will short and eventually cause a fire.
2)Battery's are 12 volt but on a volt meter will show around 12.4-12.9 ish,it is fine to jump most bikes from a car.
3) Difficult one as I do not what you would be repairing or what your bike uses I would carry something around 20amp wire that would get me home but I have a different bike.
4) If you are only measuring volts switch it to the volt setting and the red wire to positive black to negative, if you are measuring battery voltage if you are checking voltage from a wire negative to earth, frame is good,and the positive to the wire. My best advise is to get someone who knows what they are doing to give you a lesson in the basics.
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