Turn Signal

I have a 2002 Monte Carlo SS, I have been having a problem with my turn signals working sometimes. I changed the turn signal switch that worked for a little while but its happening again.http://www.automotiveforums.com/vbulletin/images/icons/icon6.gif

What might I look at next to solve this problem???

Does it occur with all the signal lamps (all four corners/both directions)? If so, the flasher might be worth investigating.

Do the 4-way hazard flashers operate normally?