The attached wiring diagram is for a garden tractor. It uses a Briggs and Stratton engine that utilizes what is referred to as a Tri Circuit Alternator.
It has a 22 VAC stator and the single output stator lead has two diodes, one positive bias and one negative bias. The positive DC output is for charging the battery and the negative DC is for the headlights. One side of the headlight circuit is from the diode (-DC) and the other side is from the ground bus side where the battery negative is attached. I know one diode is conducting on positive side of the AC cycle and the other diode on the negative.
If the one diode is supplying -dc to the headlights why is the other side of the headlights terminated to the negative ground side and not to the positive.
I am having a hard time understanding how the headlights get the positive voltage.
It has a 22 VAC stator and the single output stator lead has two diodes, one positive bias and one negative bias. The positive DC output is for charging the battery and the negative DC is for the headlights. One side of the headlight circuit is from the diode (-DC) and the other side is from the ground bus side where the battery negative is attached. I know one diode is conducting on positive side of the AC cycle and the other diode on the negative.
If the one diode is supplying -dc to the headlights why is the other side of the headlights terminated to the negative ground side and not to the positive.
I am having a hard time understanding how the headlights get the positive voltage.
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