GMC Troubleshooting Questions? Ask a Mechanic for Answers
The resistance on the circuit is less than expected so its fast flashing to warn you of a bulb out, verify all of your bulbs are good and that you are using factory ones and not LEDs or anything like that. If nothing there and there isn't a different part you can grab a rheostat from radioshack, like a volume switch, hook it inline of a bulb and with the blinker on vary the resistance until it blinks normal speed, once its normal speed use an ohm meter to measure the resistance of the rheostat than you can jump online and order a inline resistor of that value and install one in each side.
Hello, there were two flasher options for this model depending on if it had digital dash or not.
Non digital dash is ACDELCO 19209674
Digital dash is ACDELCO(###) ###-####/p>
If my answer has helped you, please help me by leaving a rating or accepting my answer so I may be credited. Rating or accepting my answer does not cost you extra. It allows me to be credited for my work. Please rate or accept. Follow up questions concerning this are always free, even after rating or accepting. Thanks!