Turn light signal blinking fast but the bulbs appear intact, just dim. What can be the problem?

My Honda Civic 98 has its right turn signal light blinking very fast, however both front and rear bulbs are working, they just also blink very fast and seem much more dim than on the other side. What could be the problem and how do I fix it?

You have a bad ground on one of the bulbs or sockets.

Jethro might be right, especially if it works the same, parking lights on or off.

If it's different with the parking lights on, I'd suspect a dual-filament bulb. Trial and error for front or rear.

Bad ground wire some where.