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Just grabbing the first 2002 Volvo Replacement Headlamp I could find the headlamps run at 12V/65W, meaning it would draw 5.4A of current. If you hooked up a 1k resistor and ran it straight to ground while the lightbulb was on, that resistor would pull 12mA of current, adding an additional 0.2% load to the battery. From the car's perspective, you'll be ...

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