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Wow, Zilvia has let this thread down.
When you turn the key to 'ignition on', if everything's wired correctly, you'll hear the fuel pump prime for 5 secs. There's a relay click when it starts priming, and a relay click when it stops. If you don't have that - STOP.
The ECU sends a signal to the fuel pump relay - I believe it's pin 104 on the S13 SR harness, it's black and pink. On the S13 it connects on one of the power plugs (forgot whether it's grey or brown).
As far as starting - you've got a few systems here. First is the starter itself - gets constant 12V from a thick black/red wire to the battery terminal. Then the solenoid gets 12v power through a slightly smaller black/yellow wire from the ignition switch, through the fuse box. It grounds through the intake manifold.
Nothing happens unless the clutch pedal gets pressed (interlock relay gets grounded). You can try pulling the switch plug out and shorting the two pins.
Get your harness sorted, then start troubleshooting the starting system.
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