My front right blinker is much dimmer than the left. I just replaced both bulbs and noticed this.

What could it be?

 

ground....or resistance in the original wiring

 

How can I check?

 

well id start with the grounds...more than likely they are a little dirty. just follow the wire back from your light till you happen upon the ground( i dont know where it is off hand probably screwed to the core support or something)

 

Will do. I just went outside, (dark,) and turned on my lights. Well the dash arrow is lit up the same sie that is not working properly! WTF