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Need A Favor: Wall Charger Check

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If it's any reassurance, as long as you are seeing a solid green light then you are wired correctly - it does robust checking of the circuit before powering up. Unless you just have an outright faulty unit the only issues which may be revealed when plugging into a car to charge are incorrectly set current level or insufficient wiring/breaker size, though really that should all be double/triple-checked visually before ever plugging it into a car in the first place. A car will charge just fine with wire that's too thin, but it would still be a fire hazard.