RB20 "click" but no start

[Zenk1_love]

Quick background:
95 240sx
RB20det
Wiring conversion done by Yuri at Wiring Specialties
Using Their pre-made lower harness. Both pieces excellent work

Anyway, I have everything hooked up. I've gone over the whole harness several times. Everything is grounded. Put the key in, lights come on, fuel pump comes on, when I go to start it, I get a loud "Click" from the starter, then nothing. It doesn't continue to make the noise. Just one and done. Could my starter just be bad? I'm really at a loss here. Any help is much appreciated.

Edit: The 75 amp fuse in the fuse box was blown, replaced it today, still does the same thing.

UPDATE:
Turns out I was grounding the starter from the solenoid post so it wasn't maintaining voltage. Now it cranks no problem, but doesn't ever start. It's getting fuel. But no spark. I checked the voltage in and out of the ignitor and everything is good there. Could by coil packs be shot? How can I test them? Thanks for the help.