I stuck an ampmeter on mine once. At idle with no accesories on, it was around 20amp's. At idle with absolutely everything that could be turned on, on, it was around 42amp's. A/C at max, doors open, high beam head lights, brakes, hazards, rear defrost, stereo cranked etc... I've just got an Escort, so it doesn't have many accesories at all.
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