Thanks Graham, but the early +8s aren't quite like that. The fuse for the horns and radiator fan (through a relay) is fed from the ammeter. Two other fuses are fed from the ignition switch, and the fourth between the lighting switch and the connected lights and spotlights. The pre-engaged starter solenoid (mounted on the starter) has the battery +ve connected directly to it and also 4 other brown wires going round the car. So a single power fuse will not work without a major rewire.
Arwyn - yes, four glass fuses and two spares, but I doubt all all 25 A.
The horn being wired outside the ammeter circuit (although often connected for convenience to it's battery side) seemed to be common practice in the 60's and 70's and maybe earlier, for both cars and motorcycles. Handy on my Velocette and Land Rover as the ammeter records the compensating positive current back towards the battery when horn is operated, proving dynamo is working.
Having all the brown positive feeds from the pre-engaged starter terminal makes sense as ideally the main positive battery cable runs directly to it.
