On mine (2042), the hour meter shows the battery voltage for a few seconds before it changes over to hours. I find this is handy for checking the status of the battery.
As far as the wiring goes, mine has a small green wire w/ the large black cable, and a small red wire with the large red cable. I'm not sure, but I don't think you would have knocked a wire off by jumpstarting it.
Crank it up to full throttle. It should have enough voltage to engage the PTO unless there's something wrong with the alternator. Also, check the fuses under the hood - there are three that I know of.