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I never use car’s cigarette lighter so took it out and replaced it with a voltmeter which can also charge my phone. When I removed cigarette lighter, it was attached to 3 wires, a red, a brown and a thin grey wire. Voltmeter had 2 prongs, a positive and a negative. So, I assumed the red wire from car would plug into the red positive and the brown would go with the negative prong. I assumed the thin grey wire was for lighting the cigarette lighter, so I left it alone.
After I buttoned up everything, voltmeter didn’t power up, and thankfully no fuses got blown, that I could tell. I’m not sure why it’s not working, but is it possible that brown wire is positive and red is negative?.i could remove center console and check polarity but it was a pain in the azz, which I’d rather not do.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
