I'm going to use my zumo 660 on a rental bike in europe so it is likely I will see some wet weather. I am planning on using the car mount bracket with cig lighter power cord, attached to a handlebar mount ball that fits into the car bracket (standard auto 17 mm ball size). My only concern is the power cord connection to the garmin bracket is not waterproof. Should I anticipate problems if it rains and if so, other than throwing a zip lock bag over it, any better way to protect it?