At 02:53 PM UK time 5/30/03, Bob in Pittsburgh wrote:
"Where do the 35 amp and the 50 amp fuses go? Which is the A1-A2 etc???"

Notice that the MGA fuse block has five screw terminals. In original orientation the center terminal goes at the top. That terminal is electrically common with the next screw down on the left side, giving two output terminals for the top fuse. Power inputs are on the right and fused outputs are on the left (as you stand looking at the unit).

The bottom fuse position is for the horn only. This takes a 25/50 fuse, Brown wire on the right and Brown/Green wire on the left.

The top fuse position is for everything in the car which is fused and is switched on with the ignition switch. This takes a 17/35 fuse, has 3 White wires on the right and 4 Green wires on the left (2 per terminal). One white wire is power input from the ignition switch. The other two White wires are unfused power going to the ignition coil and fuel pump. The Green wires go to the wiper motor #2 terminal, fuel gauge "B" terminal, flasher unit "B" terminal, and the brake light switch.

Additional foot note: The screw threads for the terminal screws in the fuse box and voltage regulator are 1/4-26 BSF threads. If you need replacement screws I suggest you find a junk fuse block or junk regulator. The screws are obviously still made, somewhere in the world, as replacement regulators and fuse boxes are still being supplied. I just have no idea where to buy the screws new in the USA.