Heathkit SG-8 Signal Generator

[Notimetolooz]

There is a little thing called "Google". You ought to try it sometime.
http://pdf.textfiles.com/manuals/SCA...thkit-SG-8.pdf

The connector used on that unit are what was known as microphone connectors. The end that goes onto the cable end can be found but a better solution is to replace the connectors on the generator with BNC jacks. There are even pre-made cables with BNC plugs made. I believe that the stock cables were coax with alligator clips on the other end.
There are a number of sources for general instructions on AM radio alignment. Usually the service data for each radio gives further details.
Most of the time you can connect the generator cable clips to a small coil of wire (4-6 inch diameter) with something like 8-10 turns. This coil sends a signal to the radios antenna loop. Some radios don't have antenna loops and the coupling is done another way. Sometimes the signal is injected into the radios IF circuits various ways.
I recommend a book like this one.
https://www.amazon.com/Old-Time-Radi...s=books&sr=1-1