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One problem is that the alternator isn't as large as it could be. When driving in cold weather the heater motor draws a lot of current, while the battery doesn't charge well because it's in the coldest spot in the car. I haven't had a warning, but when it's cold after returning home from a drive my tender never reads the battery as having a full charge. It does always show it fully charged the next morning, so I chalk it up to the engineer who decided to save five pounds of weight by using a too small alternator.
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