98 Jetta TDI Starting Problem

After fixing the horn on my manual 98 Jetta (it was the relay), now it won't crank over.
Starter switch tests fine, and starter solenoid works, but the 12V signal is getting interrupted somewhere in between.
I jumpered out the clutch switch, still nothing.

I'm assuming the clutch switch must run a relay, but my Haynes manual doesn't show it.

Does anyone know if there is a relay, or fuse, and if so what the number is? A wiring diagram would really help.

Thanks