On Tue, 10 Dec 2013 13:02:31 -0500, Stormin Mormon wrote:

Typically, yellow for cooling. But, if the
blue is connected to Y at the air handler,
we're all good.

Based on this discussion of colors and abbreviations, I took a closer look
and snapped this large-format picture for you to guide me:
http://farm8.staticflickr.com/7395/1...61f28c11_o.gif

As you guys noted, there seem to be 6 labelled attachment points,
with the following 4 wires connected:

R = red wire
W = white wire
G = green wire
Y = blue wire
B = nothing is attached
O = nothing is attached

Is the voltage to be expected a DC or AC voltage?
What's the range? (I'm assuming it's *not* 120VAC!)

What would you use as the ground point for the voltage test?

PS: I will jump the wires, as suggested, but first I want to see
what we have before I jump stuff.

PS: I don't see a fuse, but I do see a resistor.