Is there a way of pulling the wires from the headlight block connectors without damaging the connector
I want to pull the wiring loom back to the bulkhead

They have little spring clip prong that pops up when you install them in the plastic connector. If you slide a little flat jewelers screwdriver down the between the connector and the plastic you can push the prong down and pull the clip out.
When reinstalling the connector you will have to bend the prong back up.

This is a good how to:

https://www.mytractorforum.com/12-john-deer...s-cleaning.html

Brilliant
Thank you