Hi John,
I had that issue with my 740 and the only thing I didn't try was a NEW starter solenoid.
First wire brush the terminals at the battery including the piggy back wires on the positive terminal. Check each terminal end for corrosion where the wire enters the crimp, telltale dark blue or green is one tipoff for a bad terminal.
Lube with conductive grease, nickel or copper anti-seize or Penetrox-A.
When it doesn't start with the key, try putting +12 volts to the service port
in the engine bay near the power stage. See if it starts with the service port.
If that fails you can look for a binding solenoid and service or replace.
Probably the re-builder used the original solenoid.
Good luck, Bill
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