Vortex Sound Research

12v +/- question

Hi, I was trying to figure out a way to check if my eurorack modules were working and I'm was sitting around thinking where I could get a good 12v power source and ....Shaaa-Zhaaam...it hit me. My car just happens to have 12v's sitting underneath the hood!!!! I'm soooo excited I don't have to spend any extra money! So do I just get a jumper with gator clips to go red stripe to 12v+ battery power and black wire to 12v- of battery? I'm thinking I should get some lights and effects from the module. Am I thinking right or am I way off? Thanks for helping.