Only show page title, not excerpts or full, on tag pages.

Hopefully I didn't just miss an obvious option somewhere (there's so many lol). But to elaborate, I'd like to simply show a list of page titles instead of excerpts on tag pages (ie. http://site.com/tags/foo)

The problem is that I have google maps and custom field data on each page, and when it shows excerpts or full, the custom field data is pulled and displayed inappropriately in the custom field sidebar widget.

Any help would be much appreciated, thanks in advance.