diagnosing a non-working blower

[npmccallum]

So my blower isn't working. Before I start replacing parts, does anyone know of a diagnostic for the blower? Particularly helpful would be a schematic or at least some ad hoc tests to determine which part has failed. I haven't tried removing the blower motor yet, but I'd assume I could probably just connect 12v somewhere to see if it at least turns on (or is it more complicated than that?).

[Fonzi]

Open the blower cover and find the plug. Turn on the blower. Check for power.

There is apparently a resistor to keep something from overheating or something like that.

[petesmga]

There are multiple wires going to the relay but only 2 going to the actual motor. Disconnect those 2, check blower with jumpers and backtrack from there if the motor works.