91 Camry - Cigarette lighter plug active w/o key?
In my personal opinion, electrical current recharging, unattended for a long period of time, backflowing through a circuit not designed for it with the proper fuses and protection, is asking for trouble. Wouldnt it be better to disconnect the battery, and have it fully charged when you get back? The downside is that you will lose radio code and check engine history, but if the check engine light is not on, you havent lost much.
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