Maintenance for the week of March 9:
• NA megaservers for patch maintenance – March 9, 4:00AM EDT (8:00 UTC) - 12:00PM EDT (16:00 UTC)
• EU megaservers for patch maintenance – March 9, 8:00 UTC (4:00AM EDT) - 16:00 UTC (12:00PM EDT)
• ESO Store and Account System for maintenance – March 11, 9:00AM EDT (13:00 UTC) - 1:00PM EDT (17:00 UTC)
This may be a stupid question, but what happens if you improve a dropped item, say a Thunderbug Carapace Helmet to gold, would adding a glyph to it improve it in any way?
When you upgrade an item without changing the enchantment, the enchantment is also upgraded. If you put a new enchantment on it, it will not be upgraded.
As I understand it, when you improve the quality of a dropped item, the strength of the default enchantment increases along with it. So for example, if your Thunderbug helmet started out purple and you made it gold, the post-upgrade enchantment would have the strength of a gold-quality glyph. So the only reason to re-enchant an item you're upgrading is if you want to change the enchant to something besides the default.