Headlight Help

Need some ideas guys. With the headlights on low beam, they're very dim. I checked voltage at the headlights and only had about 6.5v. On high beam they seem fine, and read about 11.8v at headlights. I have replaced both the headlight switch and dimmer switch, but that did not fix it. The wire coming into the dimmer switch from the headlight switch (a light green one) has 11.8v. The wire coming out of the dimmer switch going to the low beams (a violet one) reads only 6.5v. Is the new dimmer switch bad?
Thanks in advance.
Author: dustertogo