On Friday, March 22, 2019 at 1:39:44 PM UTC-4, KenK wrote:
A friend has a swamp cooler blower with a built-in motor. And that's all.
The motor wires are orange, red and black.

I told him I'd guess the black is common and the other two wires are for
low and high speed. If so correct hookup would be one side of 120 VAC to
black and the other to either other wire.

What do you think? I know this is extremely little information to go on but
I'm curious at what you would guess about this.

TIA


--
I love a good meal! That's why I don't cook.

I would agree with your assessment, provided there is no start capacitor
external to the motor involved. You'd think you could just trace the wires
and see where they go, and or use a meter, no?