I'm having a bit of difficulty with the wiring for the brake light on the E52 Gvi top case. Their instructions leave much to be desired and their English translation is terrible. The difficulty is the getting the brake light wires from the 650. I did manage to take off the correct panel on the back of the 650 to get to the brake light wires. I don't know which wire to use, it says positive and negative and I can't tell which is which. I also don't know how to detach one of those wires to connect with the top case wiring. I've got the top case all done as far as preparing it to connect to the wiring on the scooter. It's just getting the wires from the brake light on the 650 to connect with the top case wiring.