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Can we do some simple tests? From memory, based on my work yesterday on a 71, which has some elements of a 74 in the underdash wiring.
1. Key on, light switch off. New relay and flasher in. Hold finger on relay and turn switch to first position. Relay should click closed. Then pull switch to position 2. Relay should click open.
2. Then shut off switch, pull relay out far enough to touch posts with probes. Should be no volts at any post. Pull switch to first position, relay should click closed, 86 should be hot.
3. Pull switch to second position, relay should open, and either 87 or 87a should be hot, operate hi/lo switch-87a or 87 should be hot alternately.
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