Looking the design over....The relays would be used as the switch in the circuit. This would means that you would need 12 LEDs and 12 Resistors.
Thanks for the insight! I'm accually only going to need 1 LED and 1 resistor, because i'm going to be adding the test circuit on the line coming back to the device... Plus, I think i'm going to use a little buzzer I have, and not an LED, or mabye both.
Just orderd the main module a few minutes ago, on ebay they sell it for $32 + Free shipping, the same company however sells it for $19 + free shipping on thier website!
I'll make a topic or guide on how to make this... so stay tuned [=
Also, I did a quick test and found out that a AA won't heat an X-mas light, so that clears alot up for me. I got a device that holds 8 AA's and has a plug in for a 9v battery connecter, (and 8 AA = 12V) so that what I'll use for the field module, and then the E-matches I'll shoot with a 9v so that its nice and compact, although I might throw in another AA to power my continuity check circuit without a resistor.