1980 w123 no start/turn over

[The Grinch]

My brother has been using this car for the winter
617 non turbo

It is dead at his work. I work most days so only have time after work to mess with it.

Here is the issue as they have been told to me:
- Key feels loose in ign
- Gets glow cycle
- When turned to start just a click

Worked fine when I started it the other day. I did not notice slop in the ignition. So I am going to mess with it tonight after work and see if we can atleast get it home.

Here are my thoughts:
- Check battery first. It is a new Bosch but maybe he left a light on?
- Check battery terminals / wires
^^ easiest first

-If not that I will check the back of the igniton switch to see if the connection came loose
-Maybe I can jump the starter to get it home??


Any other comon issues that might be causing this? Car neeeds to run so I can atleast get it home and fix it.

Any input would be great. Oh owning old beaters can be so much fun