The 1971 FairladyZ-L for a while would occasionally just make a single "click" relay-type sound somewhere under the dash when I turned the key to "Start" and the starter didn't do anything. I would turn the key off, and then try again sometimes with the same result. Usually it would work the second or third time and the starter would engage. We replaced the starter, the switch on the end of the ignition tumbler, and checked the battery. All those checked out okay. When it just made the click there wouldn't be any electricity at the starter solenoid b/y wire where it connected to the solenoid tab. I jumped from the battery to the solenoid and the starter worked.
The wiring diagrams I have don't show anything between the ignition switch and the starter solenoid except for a lock-out on a car with an automatic tranny; we have a factory 5-speed manual transmission.
Something under the dash makes the "click" sound when I try to start the car with the key.
What I should be looking for causing the problem of no electricity from the ignition switch to the starter solenoid?
Thank you.