haha, not a problem. i wasnt really sure if i was shoving it up far enough so i just pushed it up as far as i could lol...got my shoe stuck on the globe in the process lol
the best ground will ALWAYS be directly back to the battery
if u have have + of one battery connected to the - of the other battery ur voltage should be around 26-29 volts...if u have it + to + thats where the voltage should be