Something else to be aware of, when dealing with cars of that and indeed later eras, that use screw up electrical connectors, is that copper is a soft and ductile metal that slowly, over time, simply moves out of the way if put under pressure. A bit like me.
Which is of course exactly how a screw up terminal works, but only for a while.
I see a number of these screw type terminals in the circuit diagram, so it might well be worth quickly going around all these and making sure that they are all still tight. You might be quite surprised.
(The same issue can also arise in your house wiring, which would take rather longer to check over)
Roger
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