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Just recently purchased an used 2003 Ram 1500. Only issue is battery keeps draining and I have found the cause is when truck is completely off the windows and stereo equipment still work until the battery is completely drained. What could be causing this?

My car used to do that too. It was because the switch that turns everything off when you open the door was stuck in, so it wouldn’t turn accessories off. You know, like the light in the fridge??