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I'll also add that I had a very similar symptom on my truck which turned out that the starter solenoid was on its way out and eventually welded itself open which eventually melted out a battery. So I don't think there's a shortcut for checking each piece independently, which really isn't that...

Work your way through the system: 1. Batteries full 12v each at terminals 2. Batteries full 24v at terminals when connected 3. 24v continuously at both ends of wire #7 4. 24v at wire #3 when start button depressed If 1, 2 or 3 are no check batteries, terminals and ground If all are yes but 4...