The good ol' blazer (2002) recently started acting funky by intermittently not starting and not cranking. Now it's 100% not starting or cranking. I've tested the circuit and what's really odd is if I jump pin 87 and 86 the blazer starts right up. What could that mean for what's really wrong? i do get voltage at 87, I've tested multiple new relays, all fuses related to the ignition system are good. I'm pretty confused as to where to go from here. Any thoughts?

edit: Solved; after repairing the purple wire on the starter I decided to change the 10A Crank fuse and all is well now

 

never mind, the fuse swap didn't work. 175A mega fuse changed, 87 is till hot at all times, 86 ground is good, pin 30 I get nothing (no hot no gnd). Thus, I'm assuming there is an issue with the pin 30 side of the circuit and an issue at the 87 side because according to the diagram 87 shouldn't be hot till A:85+86 circuit closes in the relay and switches the poles in the relay to close the 30 and 87 pins to crank the truck. Also, theoretically 30 and 87 should be able to be jumped to bypass the 85+86 side of the circuit; which obviously isn't possible.