I've been addressing electrical issues recently and thought these two pics may help. First is a rear view of a fuse block & relays "mock-up". The harness is from 1056 and from close comparison I know relays on 1010 were wired identically. Presumably your car would be the same. Note the block is from a Pantera so the connections don't exactly match an OEM Mangusta block (that's why the red and pink feed wires that go to Fuses 6 & 9 - counting right to left - are not actually connected to anything, just dangling near where they should connect).
Not sure how early cars were set up but for c. 1970 cars - (as far as I can tell!) - these relays served to power loads on Fuses 10 & 11. Additional relays for the lights and emergency flasher functions were under the dash beside the horn relay.
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