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Apologies in advance for such a basic question. Having trouble interpreting the wiring diagram for the starter/solenoid connections.
I have connected the smaller black wires at the top that I believe end up at the carb starting switch. Negative battery cable is connected to the outer lower post. That leaves two connections, one is a combo of a black and a red wire and the other a single black wire. They obviously go to the lower post(s), but which ones?

Also, the wiring diagram seems to show a heavy cable connecting the solenoid to the starter motor - is this internal or am I missing a cable?

Thanks.
Mark

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The heavy cable you mention is actually that brass strap on the left hand terminal in your photo. Your homeless heavy wires go on the right hand terminal to supply power to the rest of the car. The left hand terminal is only hot when the car is cranking.

One small clarification. The two black wires on the top are the starter terminals for the solenoid and connect to a relay coil inside the square box. Both wires don't end at the starter switch though. One wire goes to the carb switch for the voltage and if car is still stock, the other goes to the ARM terminal of voltage regulator for the ground. The Senior cars with 356 engines and Autolite solenoids have sort of a safety circuit built in and get the starting circuit ground thru the generator. The same circuit on 356 seniors was used thru 50 and maybe longer on the Patricians. It can be a source of confusion/trouble if that little detail about the ground is not known.

The circuit works by taking advantage of round about wiring. When engine is off generator is not putting out any voltage. Since the armature is connected to ground internally, solenoid relay goes thru generator windings to that ground. When engine starts, generator starts putting out voltage so the "ground" is no longer ground. With both starter terminals seeing the same voltage, the car cannot be accidentally cranked while the engine is running.

One thing to remember if the generator is removed and alternators substituted, you have to change the wiring to the starter slightly. The circuit can be a problem if the generator is going bad. With an open winding, bad connection, or bad brush contact, sometimes the car won't crank because the solenoid relay doesn't have a good ground. If that was an issue, on some cars the circuit was changed to one more conventional so the wire was removed from ARM terminal and connected to a solid ground. If that has occurred, then the safety circuit is no longer present and starter motor can be energized with engine running if other things don't prevent it.

Thank you gents - particularly for explaining the background.
Getting closer to start up.....