How to find ignition wire on 2004 Chevy blazer to

CPS. Lot of details in the link.

https://www.google.com/search?q=2004+Chevy+Blazer+crankshaft+Position+Sensor+location

..

ignition switch ? Key & lock cylinder or the electrical switch ? Do you know how to test the ignition switch electrical circuit's using a volt meter ,hook up a professional scanner an check for module communications . Free wiring diagrams here http://www.bbbind.com/free-tsb . Did you get the switch installed correctly ?
How to Replace Your Ignition Switch in 2003 2006 GMC and Chevy truck and...

Here you are, this should help. How To Replace GM Passlock Ignition Key Lock Cylinder and Relearn Procedure

Have you checked the purple wire directly at the starter for power when the key is turned to start? Is the vehicle equipped with any type of remote start or alarm system?

Do you have a code scanner? What code does it give? If you don't have a scanner and the car is drivable take it to an autozone and have them hook it up to the scanner to get the code or you can buy a cheap scanner for $50 if the blazer was not running rough before you may have not pushed a plug wire on completely and now the engine is misfiring on that cylinder. how many miles on blazer? the platinum plugs from should be good for 100K miles.

check the battery in the keyless

My 1992 Chevy blazer s-10 starts and then the door locks automatically starts locking and unlocking...It wont stay running either...

they are your speeker wires. the best the to do is to hook up the colors that are the same color to the color wires on the back of the radio. dont hook them all up at once two colors at a time.by doing this it will let you know what speaker you have hooked up.

Instructions to program a keyless entry remote for a Chevy Silverado. They also work on 2003, 2004 and 2006 Suburbans.

1. Close all the vehicle doors.
2. Insert the ignition key into the ignition lock cylinder.
3. Press and hold the DOOR unlock switch.
4. While holding the DOOR lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
5. Release the DOOR unlock switch. The doors will lock and unlock to confirm the program mode.
6. Press and hold the LOCK button and the UNLOCK button simultaneously on one keyless remote. After a delay of approximately 15 seconds, the doors will lock and unlock to confirm the programming of that transmitter.
7. Repeat the previous step to program up to four transmitters.
8. Turn the ignition switch to the RUN (one more click forward) position in order to exit the keyless entry transmitter mode.
9. Operate the transmitter functions in order to verify correct system operation

95-97 blazer or 94-97 S-10
12volts red (there will be 2)+ ignition harness
Starter purple or yellow + ignition harness
Ignition pink + ignition harness
Second Ignition white or pink/white + ignition harness
Accessory orange + ignition harness
Power Lock lt. blue + either kick panel
Power Unlock white + either kick panel
Lock Motor gray drivers kick panel
Unlock Motor tan drivers kick panel
Parking Lights+ brown switch or rear harness
Door Trigger white - keyless module
Dome Supervision use door trigger
Trunk/Hatch Pin tied in with doors
Trunk/Hatch Release black/white + switch or keyless
Tachometer white AC ECM
Brake Wire white + at brake pedal switch
Parking Brake black at the pedal
Horn Trigger black - steering column