Help! Blower motor wiring - 6 colors - no black or white!
No diagrams or labelling (otherwise I wouldn't ask!)
EAD, Eastern Air Devices, EAD Motors (I called, no longer supported)
Model: B63B8D-1 (new, stored since manufactured in 1970!)
115/230 Volts
50/60 Hz
1 Phase
15 uF 370 VAC run capacitor
1640/1870 RPM
625/750 CFM (cu ft min) at 0" SP (static pressure)
Continuous duty

6 wires same length & gauge:
Blue - high?
Yellow - med? Common?
Red - low?
Purple (violet) - common?
Brown - capacitor?
Green - ground?

2 black wires on external capacitor - to brown & common?

Thank you kind reader! I owe you a cold beer or 12!

What makes this so tough is the fact it's a dual voltage motor. I doubt very seriously EAD made the motor. Any other labeling on the motor itself?

Pic below of nameplate. "7209" and "EAD 3" rubber stamped in white. No other markings.

At first I thought:

blue = high
yellow = med
red = low
purple = common and capacitor
brown = capacitor
green = ground

but then I checked resistance of all combinations:

see: Motor Doctor Article Detail - Century Electric Motors - Regal Beloit EPC, Inc
start circuit= 2 leads isolated from others
run circuit= 3+ leads, common usually white or purple:
pair with highest resistance = common with low
pair with next highest resistance = common with med
pair with lowest highest resistance = common with hi

my results (resistance of pairs in ohms):

green with purple = 15. With blue, yellow, red, brown = open
purple with green = 15. With blue, yellow, red, brown = open

red with brown = 15. With blue, yellow, green, purple = open
brown with red = 15. With blue, yellow, green, purple = open

blue with yellow = 10. With green, purple, red, brown = open
yellow with blue = 10. With green, purple, red, brown = open

1) would dual voltage make a difference? i.e. all wires same function for either voltage? Or only certain wires used with each voltage?

2) is my first thought above definitely not correct?

thank you for any suggestions you can make.

Pic of nameplate. "7209" and "EAD 3" rubber stamped in white. No other markings.

I would certainly expect a dual voltage motor to be wired differently for each voltage. Some water pump motors I've worked on are dual voltage & you have to make a change in the connection box. Presuming that cylinder on the side of the motor to be the capacitor, it looks to be pre-wired.
Since you posted your question in the Heating & Cooling forum, I presume the blower goes on some kind of heater?

The 6 colored wires from the motor and the 2 black wires from the external capacitor are all loose and need to be connected. Nothing was pre-wired. The original application was to cool electronic circuitry, but I plan to use it for ventilation.

Since there are 3 pairs of wires that seem to be isolated from each other, can I assume each pair goes to a different winding, such as start, run, booster?

See:

Motor Doctor Article Detail - Century Electric Motors - Regal Beloit EPC, Inc

Do the typical use of these wires tell us anything? Brown goes to start winding? Purple is common to run winding? Blue booster winding?

Thank you for your continued consideration.

I noticed you have 2 pairs with the same resistance. Something doesn't look right there. When doing low resistance checks they should be done with alligator clips onto the wire ends. If you just hold the probes to the wires with your fingers it can throw your readings off.

If I suggested anything, as far as how to wire the motor, it would be a pure guess & I don't like to guess. You might try contacting Century or another motor manufacturer. You might get lucky & find someone able to bail you out.