When I was in the working class I made a lot of AutoCAD drawings for Milvina, prior to, and while building.
Now I am a member of the old and dumb leisure class, I want to do some updates, and draw some things like circuit diagrams for our (showing my age) electric windlass.

Can anyone recommend cheap or free software that will edit AutoCAD drawings?

I have no need for (or inclination to learn about) AutoCAD's awesome power of 3D, auto dimension etc.

Thanks