For what its worth, from the Black Hole manual

F1 Sound, Speech Power Supply 12V AC   1/2 Amp Slow Blow

F2 Power Supply 10V AC       5 Amp Slow Blow

F3 Displays 60V AC   1/4 Amp Slow Blow

F4 Solenoids 25V AC  8 Amp Slow Blow

F5 Controlled Lamps 8V AC  10 Amp

F6 Playboard Illumination 6.3V AC  10 Amp Slow Blow

F7 Lightbox 6.3V AC   15 Amp Slow Blow

F8 Sound/Speech Power Supply 24V DC  1 Amp Slow Blow

Note: F8 is not used in foreign games