That's an interesting question. Completely counter intuitive, I'm curious as well.So, I have my two sets of LED's wired up so one set is on with one switch and the other set is turned on separately with another switch. That part works great. What I find strange is when I meter the voltage on the AC line coming out of the stator it seems to INCREASE voltage when I turn the LED's on?! lol IE, it reads 15.5V or so with NO load. Turn on the stock light and it will drop to 14.xV....then turn on the handwarmers while leaving the stock light on and it will drop to 13.xV.
Now, if I turn on the first set of LED's it goes up to like 16.xV, add the second pair and it goes up to 17.xV. If I leave all four on and then turn on the handwarmers it will drop to 14-15V IIRC. I was measuring the voltage drop because I wanted to compare it to the stock stuff. I was surprised to see what I saw.
Can any of you electrical gurus explain what I seeing?