# Why is this light in this parallel circuit only working in series?

I have a set of christmas lights I have shortened. I don't understand what is happening here.

Both wires work to light the second half, but when I connect it all together (1), the light on the first half does not work??

In (2) and (3) I showed that power is still passing through both wires, except that it does not light the first half. So the problem is not a short in the wires themselves.

In (4) I show that the bulb lights up when I put them in series. So I also know the problem is not the bulb.

What is going on here? I don't understand what I am missing.

Here is a picture showing illustrations:

UPDATE:

Ok, so by looking at a new uncut set, I have learned that the original was NOT in fact wired like above. Thanks to a commentor who pointed out that it is short-circuited, I went to a new set and learned that it was not wired as it originally looked. I also cracked open one of those lights with three wires to see what it looked like inside.

Here is a modified diagram of the actual wiring of the original. I popped off the bulb so you can see how it is attached:

• A riddle? When you short-circuit a light bulb, the voltage across it is zero. And a light-bulb which has zero voltage across its terminals will light up? Oct 28, 2016 at 1:05
• Please note that the black line is the negative. The green line is the positive. The light is not short-circuited. In (1), all four lights are connected to the power source. Oct 28, 2016 at 1:06
• Yes it is. You've short-circuited it with the green. Oct 28, 2016 at 1:07
• The same thing happens on the other half though, look, why does the other half light up? Oct 28, 2016 at 1:08
• These pictures are misleading. The green line below the upper middle candle should be another conductor, right? That's how it is used in #2. Oct 28, 2016 at 1:12