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Adaptador de corriente alterna magnético de segunda generación para productos MacBook, lanzado por primera vez en 2012. No es compatible con sistemas de generaciones anteriores Disponible en versiones de 45W, 60W y 85W.

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Check if work with multimeter

Hi everyone,

I have x3 MagSafe 2 - 85W adaptors which I want to sell but I want to be sure they are fully working. I sold my old MacBook and non of my friends have MagSafe compatible Mac so can't check it direct way. I have multimeter at home.

How can I check this charger with multimeter to know if its work or not?

Would appreciate your help

Update (12/09/2022)

@geirandersen I set a multimeter at the setting (see pic) and the it showed 3.1

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@roderos I’ve attached a pinout image for the MagSafe 2 charger.

Test black probe on Ground and red probe on Power. Both Power pins should have very similar output. If there’s a large difference or the voltage if the voltage isn’t ~20V, you have a bad charger. By large difference I mean anything more than a few millivolts.

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So the output from both Power pins must be around 20V?

I have 85W charger.

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@roderos Yes. You can use any of the Ground pins, but both Power pins should have ~20V. Output voltage doesn’t change with Wattage rating. It’s the amperage that it can possibly draw that is higher on the higher rated chargers.

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@geirandersen just have a chance to test it out now. sorry for silly question, do I need to have charger plugged into the wall to test it?

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@roderos Yes, the charger must be plugged in to the power, otherwise it has no output ;)

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@geirandersen thanks :) I tested x3 chargers both pins an all of them show 3.08-3.1 at DC Voltage 20. Does that mean that they work at full power?

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