There's always a possibility that hooking up anything to your vehicle's electrical system could cause an issue, but I can say that I've been using C Tek 3300 chargers for the last 3 years on 2 different bikes, 3 newer vehicles & 2 classic cars without any issue just plugging them in & forgetting about them for the winter. My 02 Camaro will drain the battery over a month or two of storage. I make sure the charger is hooked up to the car/bike battery & then plug it it & set it. No issues, they work as well in an unheated garage as a heated one. I know of others that use the C Teks left connected over the winter and have not had any issues.
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