So long story short I’m an idiot. Didn’t even think about it.
Did the spark plugs on my 04 Z touring, but I left the battery and key on and was listening to music. Save me the insults because I know I’m a dumbass. Anyways, got it all put back together and now it won’t start. Charged the battery, didn’t help.

The only thing I can think of is I may have blown a fuse while messing with the wires and the battery on. Or when I left the doors open for hours I somehow tripped the anti theft and it won’t let me start it.

what do you guys think? Thanks.

I don’t have a CEL, and I doubled check the wires on the coils to make sure I had it right. After messing with it last night it seems like I may have tripped the Immobilizer. I say that because when I turn the key, the red LED for anti theft on the dash stays on solid when the key is ON. It should go off. I have no clue how to reset it. I’ve tried all the stupid combinations turning the key ON for 5 seconds and off, repeat 2 times... doesn’t work for me. I can arm the car with the key fob and manually locking the door with the key. But my issue is when I turn the key, the light stays on.. damn am I confused right now.

I only have one key.
at this point I’m 100% sure it’s an anti theft issue locking me out. Maybe the Immobilizer. I just tried disconnecting the battery and the ecu for 18 hours and it did not work. I was thinking if I could drain that back up capacitor it wouldn’t store the anti theft anymore. I’m starting to think I should bring it to NISSAN...

SOLVED:
The fuse for the ecu on the ipdm was blown so the ecu wasn’t turning on. For those who don’t know, it’s behind the battery box. Rip out the whole thing, not just the battery cover. You’ll find it in the back passenger corner by the firewall. It has a black cover.

This is on a 2004 350z touring.

Exact problem here myself. What fuse?

Checked 77 and 87 fuses not blown. Looks like i gotta take it to nissan unless anyone else has suggestions. Red dash security light constantly with ignition key in

Unfortunately no backup key. I didnt want to thread jack but im honestly desperate