wires

Hi folks just joined I have an issue with my rear dash cam it has 2 wires 1 for power which is only 4ft long and black one that goes to front cam but there is no earth wire. Can someone please help. Thanks. Jon

1) Are there any pictures or videos demonstrating the optimal way to fit & run cables in the cover? There's a nice video on it for the SG9665GC, but I couldn't find anything for the SGGCX2PRO's different cable cover I sorta figured out a way that fits but I was wondering if there was a...