Electrical problem 6 cyl Two Wheel Drive.

If it comes on but will not blink
put 4 way flasher on and compare the two sides front and back
compare left side to right side
all bulbs should be working if not and the bulbs had been replaced suspect bad socket, short in the wiring harness, multifunction switch and or BCM,
start with the socket
Check bulbs front and back
check wiring and socket on not working bulb