@cdaddy I would use a dual fan capacitor for both speeds. I'd try a 1.5µF+3µF three wire capacitor. Most capacitors have a diagram printed on them to show you how to wire it in. Most commonly, it has a single wire on one end and two on the other. Single wire to hot and then the rest to lwo and high speed wire. Keep an eye on the motors temp and see if it stays within reason. Unless of course you have a make and model for the fan, which might help to trackdown the proper capacitor and wiring.