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For the most part, it sounds as though your ground is dead. Trace the ground wire back to where it is connected to the frame of the trailer. You'll probably find that it is corroded where it's connected and it isn't getting a proper connection. It should be the green/brown wire on the right hand side in the second picture. Disconnect the ground at the frame ...


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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