I took my motor out of my 4.3L 01 Jimmy and replaced it with a nearly identical 4.3L 02 Blazer engine. All plugs are connected. All 7 grounds are attached. Battery reads 12.47v No crank. Don't hear the fuel pump. Security light is on. I've tried 2 different security resets from online. Both didn't work. Starter has big wire attached and little wire attached along with wire from solenoid. Anyone have an idea as to what I may be missing? Any help much appreciated.

 

Wanted to add I have aftermarket radio and no key fob.

 

Power goes through Ign C fuse (underhood relay center) - then through ignition switch - then through Crank fuse (underhood relay center) - then through Park/Neutral Switch - then through starter relay (underhood relay center) to Ground 102.

The circuit above trips the starter relay to supply voltage to the purple wire on the starter solenoid, the solenoid pulls back and in turn connects the battery to the starter motor which is grounded through the engine. The engine then cranks.

Anything mentioned above fails, then engine won't crank.

Has nothing to do with security system or the PCM.

Good luck

 

Thank you very much for the quick reply. I realized I couldn't move from park and checked the park switch and noticed the plug was in. But not clicked in enough. Clicked it in and starts right up thank you again