Trying to fit a dashcam to my daughters Picanto and hardwire it in. I had a quick look at the fuses and thought it'd be a doddle compared to my Stinger due to an obviously easy earth point on one of the two visible bolts. I wired it in and it didn't work. It seems that those bolts have no continuity with earth on the car (tested against the power socket in the centre). Where can I get an easy earth from?