I just purchased a 2003 Trailblazer LS. After the 3rd time I drove it the passenger side turnsignal started flashing very fast and the front signals quit flashing. So I changed the bulbs and nothing happend. It still flasshes very fast and no front signals. occasioally they will work properly and will flash. Until I turn the TB off and start it again then the same thing. Can any one tell me what maybe wrong? I alraedy checked the ground at the right front turn signal and it is grounded. and when I check the voltage to the signals there seems to be just a very small amout of voltage coming thru but not enought to light the bulbs. ''HELP''