Started up and when I put in gear it just instantly died. Now it will not even attempt to crank in park or neutral. Fuses, relay, battery are good. All lights work, radio, all accessories. Need advice. Ignition control module? Switch? Thanks

 

What year is your blazer?

Does anything malfunction in the key on position?

George

 

2000 4.3 4×4
Everything is normal except it wanting to turn over.

 

When you turn the ignition to the start position does 12v appear at the crank fuse (10A) in the under hood fuse box?

George

 

Yes it has.

 

Then your ignition switch is good or at least the start position portion is.

Lets go to the other end. When you turn your ignition switch to the start position do you have 12V on the purple wire connected to the starter?

George