dataway - My opinion is yes, yes, and yes on all points....
And back to your first post, even if the modern relay contacts fail earlier than the GM switch contacts, you can easily replace the relay.
roger1 - great info and link, thank you! I have to assume the purple wire did not fail often and was protected by a fuse.
It would be fun for me to see the repair history data from these late 60s vehicles. Has this ever been published?
Coming up with a new vehicle design on a 1-year development cycle was an amazing accomplishment for automotive engineering organizations. And they were doing it with slide rules, manual drafting, and typewriters in 1968.
GM was certainly high tech for the time. When repairing a dash tach I was very surprised to see the circuit board was a hybrid "chip and wire" on a ceramic substrate. So I have a lot of respect for the 68 Electrical Engineering!
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