I recall that some of the relays shared the shame power source even on the standard loom. You only need 3 relays though not 4.
I'd have to look back at my loom to remind myself what I did, but basically the 3 green relays plug in to the engine loom via the brown and grey plugs. You'll find the length of the wiring quite long, you could shorten these if you wanted.
I then found there were loose wires going to the relays for power, earth and switched ignition.
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