I have a 1997 blazer it turns over fine but thiers no spark we tested at the coil the old screwdriver and wire trick to see if we could see the spark jump nothing, then replaced the coil twice still nothing. There is a wire coming out from the harness (red) right beside the battery that is not hooked up to anything wondering if maybe this wire powers the pcm? Electrical is not my stong suit so any help or dirrection would be greatly appreciated.

 

With the ignition in the RUN position, does the pink wire at the ignition coil show battery voltage?

 

Got it fixed loose connection thanks for pointing me in the right direction. The engine started runs good but.. i'm getting a check engine code p1864 from what iv read its a solenoid attached to the transmission do anyone know how to check it or steps on how to remove replace it. Or what it even looks like so i can get a starting point

 

Code P1864 Transmission Transfer Case Contact Plate Power Short - JustAnswer