If the lights are on and you put a test light between the positve and the ground, the ground will be hot, because it's completing the circuit. If you test the ground to the body it should not be hot though. As mentioned there should be a black ground from the harness or light socket that should go to the body.
off to get some new tools:yes: cant believe i dont have a conductivity meter already
i have thousands in carpentry tools now i gota spend even more on mechanic tools
not a bad thing tho always fun to get new tools
took the wheels off my john deer today what a pain in the *** that was now i need more grease that ****er had like a lb of grease on there lol couldn't even see/feel the pin needed to go online to find out how to take it off lol