That cut/paste diagnostics test was written by me and it was a posting for a 124.032 , E320 chassis specific.
Be very careful when jumping 12V battery power on any electronics as you can very easily cost yourself some shorted expensive parts.
When I post a test procedure for a specific model, I would prefer people don't cut/paste that info for diagnostics on a different model, as the assumption they are the same is a cause for concern.

As you have the CD , go to starter circuit schematic and you will see the starter lock-out series chain..
If you do not find it , I will look it up for your specific chassis.