Peter,
When we were working on my 401 I bought an electrical circuit tester/fault finder that had a battery in it to send a small charge down a wire which you could pick up at the other end, I would suggest if you bought something similar and followed the description of circuits protected in a previous post then by a process of elimination you will find the answer, or use it to confirm what the feeds in and out serve and then replace the fuse boxes with a newer multi fuse box and have every circuit individually protected which now I have thought about it makes a lot more sense, a upgrade for my 603 is on the cards.
Geoff.
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