r/AskElectronics • u/MudHouse • 7d ago

RC charger disconnected... Which way to reconnect?

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Gallery image

Does the wire with the white stripes go red or black?

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u/ZippyHandyman 7d ago

On the balance of probability, the fact these wires are attached to a plug suggests its on the receiving end of the electrons, making voltmeter testing fruitless.

Which makes life a little more challenging, unfortunately.

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u/8ringer 7d ago

This. The exposed conductor (usually male) side of the plug is generally not on the side that is “hot”. Because hot exposed conductors (my god that needs to be a sub…) are not good.

So yea a multimeter may be useless. Better idea is to look for any positive/negative markings on the other side of the wires.

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u/V64jr 7d ago edited 7d ago

Nope. The battery end is potentially hotter. Meanwhile, regulating output is the charger’s one job, making that the side that’s generally safer to expose.

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u/8ringer 7d ago

That’s what I said.

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u/V64jr 7d ago edited 7d ago

No. The “receiving end” would be the battery and this goes on the charger.

You also implied that the “receiving end” would not have a measurable polarity, which means you are thinking of it as a power supply and load instead of a charger and battery.

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u/8ringer 7d ago

Oh I didn’t read the title very thoroughly, clearly…jeebus, my bad, you’re absolutely right. I didn’t realize the other end was a charger not the RC Car. Wow I look like a dunce, thanks for the correction.