Winner - 6OTM - March 2014 2009 ZX-6R (65,695 miles and counting) |www.ZX6R.us|www.Seaton007.com
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Digital volt meter. You can get a cheap one.
Put one wire, red on the + and the black one on the -. OH, the dial on V, or voltage. If it has only flat line and wavy (doesn't say ac or dc) then it's the flat line.
To check the ground connection to the frame. The red wire on the + the black wire on the frame.
Voltage should be the same as across the battery.
If not then the connection from the negative battery connection to the frame is corroded.
Hard to say, you are going to have to start with the basics......does it have gas? does it smell like unburnt fuel at the exhaust pipe?(meaning you could have a no spark issue). You could pull a plug and see if you have spark. The battery sounds like it is spinning the motor fast enough.