Green Tri-Cree test fail?

[The Yin]

Hey guys,

What is the best method for testing the 2 greens of a Tri-cree when wired in series?

Last night I wired mine up in series, quick and easy (much easier then the Engins), but when I tested it, they would not light up.
At first I used 2 rechargeable AAs (only 2.4v total), and though the problem was from not having enough voltage.
So I tested with 1 Li-ion (3.7v) and they still didn't work.
In the end I wired them in parallel and they could be tested and worked with both methods.

So, am I somehow wiring this wrong? It's so easy and strait forward, I can't imagine that's the case.
Or, is 3.7v, for testing, not enough to get any light form an LED circuit needing 7v?

[Forgetful Jedi Knight]

Or, is 3.7v, for testing, not enough to get any light form an LED circuit needing 7v?

Well, since 3.7V is way less than 7V needed to work, I would say that was your issue. When you run things in series, you need the proper voltage to make it work.

[Strydur]

Not enough voltage for series.

[Thalan the Exiled]

Not totaly sure but I don't think the 3.7. Is enough to get them to light in series. I could be wrong but being that the required voltage is almost double what you tried to use it doesn't seem likely that it would be enough. If you have the resistors try a test with a 7.4v pack and see.

[The Yin]

Cool, thanks for the quick replies.
Now that I've got the connector wiring finished, I can rewire back to series and just plug it into my board to test.