Can you be a good technical writer without any background in technology?

All you need is to read the basics of technical writing. Online resources made it easy for everyone. There are so many exciting stuffs available in an online forum. Avail them 

Yes, you can be a good technical writer without any background in technology. To develop technical writing skill, you don't need to have a technology background. Instead, you just have to have a keen interest in technology.

The basis requirement is that you must be well in using Microsoft Office applications, especially word, excel, and powerpoint. And you also need to make yourself familiar with using graphs, charts, table, references, and review.