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· Trained (ex)Professional, , 1953-2018 RIP
16,230 Posts
The second set of points, when activated, retard the ignition timing about 3 degrees. This was to prevent engine knock on acceleration. One must keep in mind however, that the available fuel back in the late 70s had an octane rating some 6 points lower than todays fuels.

Unfortunately, the wiring diagram in the above link has an error in the ignition advance relay wiring. I know 'cause I drew it. :eek: If you'd like the revised version, please send me your email address in a private message.
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