just switch off ignition and test voltage immediately. You don't have to wait. You want (well i do), want the dash cam to switch on when you start the ignition, and switch off when you switch off the ignition.
"which ring lug would you recommend? & how do I connect it to the black earth cable supplied in the nextbase kit?"
The ring lug to use should suit the EARTH screw/bolt size, so i can't recommend this. They are just standard ring lugs in all sorts of sizes.
You CRIMP the black earth wire where i have arrowed above.
Joe
