I replace the blower motor with a MARS 10585 4 wire and my unit only has 3 wires. I think I have wired wrong because it runs for 15 minutes and cuts off but the outside unit still runs. The motor I replaced it has 4 wires yellow, black, blue and red. blk-HI, blu-MED, and red -LO. My unit has three wires red, green and wht.

Check fan speed old verse new on wiring also change the cap.

NAPA part:
Blower Motor Resistor
$ 26.49 /ea
Part Number: BR450
Product Line: Echlin Ignition Parts

follow this steps and fix it. God bless you

1. 
   
   
   
   
   • 
     1
     
     
     
     Turn the electricity to the air conditioning unit off at the
     service disconnect box. Follow the wires from the AC unit to the
     disconnect box, usually located next to the unit. Open the disconnect
     box and, depending on the type, either pull the buss-bar or flip the
     disconnect switch.
     
     
     
     
   
   
   • 
     2
     
     
     
     Open the air handler\'s access panels with the correct size of nut driver, usually 5/16- or 1/4-inch. Save the screws.
     
     
     
     
   
   
   • 
     
     
     
     
     Remove the control panel\'s cover, if equipped, with a nut
     driver. Some models have a flat metal cover over the electronic
     controls, and some control panels butt up to the unit\'s access cover.
     Save the screws and access cover.
     
     
     
     
   
   
   • 
     4
     
     
     
     Follow the wires from the blower motor. Two wires will go to
     a capacitor located on the blower\'s housing. The rest of the wires will
     go to the control panel.
     
     
     
     
   
   
   • 
     5
     
     
     
     Cut the wires leading into the control panel with wire cutters. Leave the cut wires connected inside of the control panel.
     
     
     
     
   
   
   • 
     6
     
     
     
     Remove the retaining bolts with either a nut driver, usually
     3/8-inch, or an adjustable wrench. The retaining bolts, found on the
     mounting brackets that the blower\'s housing slides on, keep the blower\'s
     housing locked into position. Save the bolts.
     
     
     
     
   
   
   • 
     7
     
     
     
     Slide the blower motor\'s housing out of the AC unit. The housing will slide straight out along the mounting brackets.
     
     
     
     
   
   
   • 
     8
     
     
     
     Disconnect the two wires going to the capacitor. They will pull straight off the capacitor\'s terminals.
     
     
     
     
   
   
   • 
     9
     
     
     
     Unscrew the squirrel cage\'s locking-screw with an adjustable
     wrench. The squirrel cage, the bladed wheel, connects to the blower
     motor\'s shaft inside of the housing. The locking screw holds the
     squirrel cage to the shaft.
     
     
     
     
   
   
   • 
     10
     
     
     
     Unscrew the blower motor\'s mounting screws with either a nut
     driver, usually 3/8-inch, or an adjustable wrench. These screws hold
     the motor to the housing and are found on the opposite side of the
     squirrel cage, the same side that the wires leave the motor.
     
     
     
     
   
   
   • 
     11
     
     
     
     Pull the motor from the housing. A drop of oil on the shaft
     will aid in removal. If the squirrel cage sticks to the shaft, then hold
     the shaft still with an adjustable wrench while spinning the squirrel
     cage on the shaft.
     
     
     
     
   
   
   • 
     12
     
     
     
     Slide the new blower motor into the housing. The blower motor\'s shaft will slide into the squirrel cage\'s hole.
     
     
     
     
   
   
   • 
     13
     
     
     
     Tighten the blower motor\'s mounting screws.
     
     
     
     
   
   
   • 
     14
     
     
     
     Spin the blower motor\'s shaft until the flat part of the
     shaft lines up with the squirrel cage\'s locking screw. Move the squirrel
     cage in or out until it does not touch the housing or the blower motor.
     Tighten the locking screw.
     
     
     
     
   
   
   • 
     15
     
     
     
     Connect the blower motor\'s capacitor wires, usually brown or
     brown with white stripes, to the capacitor. Direct replacement motors
     use the same color-coded wires as the original.
     
     
     
     
   
   
   • 
     16
     
     
     
     Slide the blower motor\'s housing into the AC unit along the mounting brackets. Install the mounting bracket\'s retaining bolts.
     
     
     
     
   
   
   • 
     17
     
     
     
     Connect the new blower motor\'s wires in the control panel
     one at a time. Disconnect one old wire in the control panel. Determine
     its color and connect the new wire, of the same color, to its place. Do
     this for all wires.
     
     
     
     
   
   
   • 
     18
     
     
     
     Replace the control panel\'s cover, if equipped, and the
     unit\'s access cover. Turn on the power to the unit at the disconnect box
     and test the blower motor.
     
     
     
     
   
   

Gentlemen,
I have a GE P547BS fan motor. I find replace it with a Mars 10584 fan motor. GE has five wires, BRN, YEL,PUR,BLK,RED. Goes through the capacitor with the yellow going on to 200 V the purple and black go to 220 V. Mars motor as a six wire connection two Brown's go to the capacitor. yellow I'm assuming goes to the hot/neutral and a black I would say would be high-speed blue is medium and red is low. Now when I connect with this way it blows the fuse. Anybody run into this problem before? Any help? By the way, it's a 240 V single phase system.

Hello, Typically your common wire will be white, high speed- black, medium speed- yellow, medium low-blue, red- low. The motor could still run for a short time if it was wired wrong but will either trip a breaker or go off on it;s overload when it's gets hot.

You are looking for the nuetral wire,look on the mars motor it should have a wiring diagram stamped on it to answer your question

basic problems]
First check these:-
1) Over load cut off (try running it empty)
2) circute failur and fuse blown

Relay. You may just have it wires wrong but relays are easy to replace. Rus

your blower resistor is bad

Do you think it might be the relay switch