You will need a rectifier if you want a battery or to connect electronics like a screen or even LED lights.
AC will light a conventional bulb though. You seem to have no power getting through to that point.
A multimeter is a good start. Cheap as you don't need a good one, just don't try it on house electrics. YouTube will teach you how to use it.
Lighting coils (power generation really) are the thick ones on the stator and rarely fail as they are so chunky.
I'd suspect that either the yellow wire is not connected to the coils, or, it is grounded along the way so it isn't getting anywhere.
Edit, sorry reread your post. If you have 12AC you have s meter, sorry. If you blip it it should climb well above 12V.
That should light a bulb. Test bulb on a battery. It's not an LED headlight?
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