My wiring for the starter is as follows......Power wire from battery to solenoid on the firewall. From solenoid to starter. 2 small wires from firewall (interior) to the solenoid.

All of a sudden, my key (when turned) is dead. I have full 12.00 volts to the solenoid from the battery but 0 volts coming out when key is turned. I tried by-passing the key and jumped the posts on the solenoid w/a screw driver, the motor turned over but very slowly, wouldn't start. I previously had a problem w/hot-starting, do you think that heat finally caused the starter to freeze up?

Secondly, as I said the key is dead when turned. Where do I follow the two small wires to in order to find the power failure? Sorry, but I am somewhat an amateur for old muscle cars. Thanks in advance!

the main battery cable (hot) to the starter. the wire off the hot cable to the small black block on the core support close to the battery and then the ground to the block. the two wires to the starter. hope some of this helps.

one wire goes to the coil and the other is the key.

I had a similar issue. No power to anything when keyed on. There's a second wire off the hot side of the battery, small gauge. It had fried and let go cause someone had done a janky hook-up. Took me forever to trace.