Welcome to the forum. 4 or 6 cyl? The radiator fan instructions are different.
If you were testing with the ignition on, it may have triggered P0480.
The Rd wire is +12v all the time. It needs a good ground on the Bk wire all the time.
The DkBu/LtBu wire turns on the fan with +12v. The Br/Vt wire varies the fan speed by duty-cycle.
Terminals #1 & #2 should have +12 volts on them and #3 will vary (on a digital meter, it may jump around), but there should be something there with the A/C on or the engine at temperature.
If you were testing with the ignition on, it may have triggered P0480.
The Rd wire is +12v all the time. It needs a good ground on the Bk wire all the time.
The DkBu/LtBu wire turns on the fan with +12v. The Br/Vt wire varies the fan speed by duty-cycle.
Terminals #1 & #2 should have +12 volts on them and #3 will vary (on a digital meter, it may jump around), but there should be something there with the A/C on or the engine at temperature.