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I've hooked this up before and it had all positive pulses.All I did was hook up positive lead from oscilloscope to positive lead to battery chger. I tried 2 different bat chgers. I'm not sure how to grd the oscilloscope. I gue3ss I'm a novice at this but am interested in it. Thanks for the input.Battery chargers have floating output so just connect the scope to the charger output leads. No need to bother about grounding.
If the rectifier is working properly and you have a load such as a low value resistance or bulb, then you should see rectified AC which will look like a chain of inverted Us. Very different from a sine wave.
Post a picture of the scope screen.
I don't have a place to grd my oscilloscope. It just has a positive outlet that I know of.Is it also possible that the input to the scope is set to AC coupled causing the trace to centre itself around 0?