LITTLE KNOWN FACTS ABOUT BLACKTOP 4AGE.

So up to the light, there is 12V. But then There exists the light along with the diode that provide it again to all-around 1V. That one Volt is required to provide the alternator the signal to start charging.I'm not Great at outlining this like this Plainly, but I hope it helps make enough sence to help you are aware of it a bit .A bit throttle to