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Charging
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Ben sage:
 Hi guys I was wondering how this old car battery charger works  because it charges battery’s with AC  and also at the 12 V setting I measure 50 V I’ve tested it it does work
Jeroen3:
As long as there is DC offset it is fine.

If there isn’t, the battery lifetime will be halved. (~2 years max)

But I suspect you‘re not probing right.
Ben sage:
It’s not DC offset there is negative and positive and I put the ground clip to the negative and the probe to positive
xrunner:

--- Quote from: Ben sage on November 29, 2019, 11:20:03 pm ---It’s not DC offset there is negative and positive and I put the ground clip to the negative and the probe to positive

--- End quote ---

You seem to be showing 50Vpp on the scope?

50 Vpp would be 25 Vpeak, and would then be 17.1 Vrms. I think the charger uses the 50Vpp into a full wave bridge, and then maybe a capacitor, so I don't think it's unreasonable. But as was said, where are you probing the 50 Vpp is the question.  :-//
Ben sage:
Here’s how I hook them up And this is what It looks like inside
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