I have only low speed on the blower motor for heat The three wires connecting to the blower motor 1] red 12volts 2] think it a blk/yellow 2 volts 3] black ground i put 12 volts to wire 2 and the blower motor stops altogether where do i go from here

• Black: Ground
• Blue/White: Power (12V) from HVAC control unit to blower relay
• Blue/Yellow: Power (12V) from blower relay to blower motor
• Blue/Black: Ground from blower motor to chassis

B+ voltage supply , ground , crankshaft position sensor B input , IC timing control , IC timing signal , low ref. engine speed signal , etc... Do you know what these are ?
Ignition Control Module (ICM) -- C1
Connector Part Information
• 12162261
• 6 Way- F Metri-Pack 150.2 Series (BLK)
Pin
Wire Color
Circuit No.
Function
A
TAN/BLK
424
IC Timing Signal
B
WHT
423
IC Timing Control
C-D
--
--
Not Used
E
PPL/WHT
430
Low Resolution Engine Speed Signal
F
RED/BLK
453
Low Reference
Ignition Control Module (ICM) -- C2
Connector Part Information
• 12162184
• 2 Way-F Metri-Pack 150.2 Series Sealed Pull To Seat (BLK)
Pin
Wire Color
Circuit No.
Function
A
YEL
573
CKP Sensor 1 Signal
C
PPL
574
Low Reference
Ignition Control Module (ICM) -- C3
Connector Part Information
• 12162194
• 2-Way F Metri-Pack 150.2 Series Sealed (BLK)
Pin
Wire Color
Circuit No.
Function
A
BLK/WHT
51
Ground
B
PNK/BLK
239
Ignition 1 Voltage

{: ) Check out the J-case fuse (square) labeled BLWR 40amps at the underhood fuseblock. This fuse is the source of power to the blower motor when position 5(max speed) is selected. If this fuse is tested to be okay, you need to access for the blower resistor connectors. Turn ignition on, and set blower to max speed (#5). Probe on the blower resistor terminal (orange wire) and you should get 12volts, also probe the terminal (red wire) which came from the 40amp fuse. 12v should be present on these two terminals at the blower resistor when at max blower speed. Particularly on the orange wire, if you don't get 12volts when at #5 position, it 's probable that the blower speed control switch is faulty. But if you did got 12volts during the procedure, then you should replace the blower motor resistor. Goodluck.

Hi I will try and help you if i can.
Yes, there will be a resistor pack that controls the speed of the blower motor.
Usually on a 4 speed motor there will be three resistors.
When 4 speed is selected the motor gets full 12volts ( no resistors used )
When 3 speed is selected the motor gets its Voltage via 1 resistor ( reducing the speed )
When 2 speed is selected the motor gets its Voltage via 2 resistors ( reducing speed even more )
When 1 speed is selected the motor gets its Voltage via 3 resistors ( giving the lowest speed ).
Usually when the resistor pack burns out the motor will work but only on no.4 speed which does not use the resistors.
So i think your problem might be the control switch.
Ihope i have been of some help to you.
John ( South Wales UK )

You have got a defective blower motor resistor. Your blower resistor is located just to the left of your blower motor (which is located under the passenger side of your dash. You may find you have a carpeted covered piece of cardboard that is located on the underside of the dash (below the glove box ) if so you'll have to to remove it by removing the retaining clips, Now look up behind the glove box and you"ll see the blower motor and just to the left of it there is rectangular unit with a connector with six wires within the connector , the colors of the wires will be as follows (black and orange)(black and yellow)(two wire's that are black and white)(black and blue)and (black). the blower motor resistor is totally bypassed when you turn your fan speed to high ! The blower speed is controlled by the ground side of the blower. When you request any of the other three speeds the ground circuit is routed through the blower resistor which is made up of three resistors.( resistors reduce the current flow) and each resistor reduces a predetermined about of current.So when you request medium high blower speed the ground circuit runs through one resistor, if you request medium low the ground circuit runs through two resistors , and through three resistors to obtain low blower speed, Normally what happens is the blower resistor blows out the circuit between the fan switch and the blower motor resistor which results in the lost of all lower speeds,no different then the wire to the blower motor just being disconnected.Replace the blower motor resistor and you will in great shape .Thanks for using fixya

There is a blower motor relay,near the motor i think,check it.

it could be that the motor itself is bad there is a relay inside the motor as well give these websites a try www.alldatadiy.com and www.autozone.com if it was me i would checkout one at a good salvage yard give this website a try to find one close to you give this website a try www.junkyarddog.com wish you the best of luck Michigan Man.

blower motor resistor is burnt out on those speeds

Cavity
1 20 amp yellow hazard flashers
2 10 amp red heated mirrors
3 20 amp yellow body lights
4 not used
5 20 amp yellow windshield wipers
6 20 amp yellow turn signal lights
7 10 amp red radio
8 not used
9 7.5 amp violet illumination lights
10 2 amp pink left tail lights
11 2 amp right tail lights
12 not used
13 20 amp yellow rear window wiper/washer
14 2 amp pink speed control
15 10 amp red gauges, warning lights
16 not used
17 10 amp red left low beam headlight
18 10 amp red right low beam headlight
19 20 amp yellow stop lights
20 20 amp yellow rear a/c heat
21 20 amp yellow fog lights
22 20 amp yellow park lights
23 20 amp yellow battery
24 20 amp yellow back up lights
25 circuit breaker power windows,power vent windows
26 30 amp lt. green a/c heater blower motor
27 circuit breaker power door locks
28 not used

This could be a few different things:

1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.

2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.

3. Connect the blower to a 12v power source and see if it runs at high speed.

If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.