I have a 2005 monte that only one signal is working, ive replaced the hazard switch and fuse, the signal fuse in drivers side panel, and multifunction switch. Is there by chance a separate fuse for the other sides signal? Otherwise what else could I try?

 

wiggle the wire harness up by the headlight and see what happens.

i have an intermittent short to ground on my harness i havent fixed yet. the signal will blink fast or not at all, then i go wiggle the harness and it works fine for a week or two.

 

A burned out bulb on one side front or rear will also cause it not to blink the side that has a bad bulb or blink rapidly.

 

I would also check the body and chassis grounds.