What fuse goes here?

[SpeciP3]

Hey guys,

just putting a headunit in my car atm, but it's not working.
power supplies are good and work fine but still can't get it to fire up.
I'm running the battery wire off the cigarette lighter power supply, and the acc off the ignition wire (black with yellow trace).
The only thing I have noticed is that the very last ceramic fuse in the fusebox has been removed but i have no way of knowing what rating fuse goes in there. That's where i pass over to you guys for an answer as i my service manual hasn't arrived yet.


Let me know what you guys have there and what you have done with ur installs.
oh btw my car is a 76 mod mk1

cheers,
Michael