My left turn signal flashes rapidly after applying the break

SOURCE: Left side turn signal

it sounds like a bad ground. check all grounds for tightness and corrosion

SOURCE: Left front turn signal bulb for 2001 Pontiac Montana

There is only one screw to remove that releases the mounting tab at the upper inner corner of the assembly. That screw has a plastic wingnut molded onto it so you can turn by hand. Once that is removed, the assembly can be pulled straight forward. At the inner bottom corner, a spring clip faces straight rearward. Pull with enough force to to release the clip from its slot. Only two "Fingers" hold the rear of the assembly in the sheet metal holes.

SOURCE: I have a 98 Sunfire with intermittent turn

i would that seem to be the problem

SOURCE: left turn signal blinks rapidly when headlights

the blinkers have a bad earth somewhere, check the earth connections on rear lights first

SOURCE: 97 Pontiac Trans Sport. Turn signal problem

verify the ground wire is good, black wire, its down on the frame rail, opposite of the air filter housing, if thats OK, it, could be the turn signal switch. but the wires go from the turn signal switch, through the Daytime Running Lights Module, through the fuse panel under the hood, then to the light socket. wire is light blue / white coming out of turn signal switch to DRL module, then its light blue all the way to the socket.

Testimonial: "Sounds like a place to go to check, the grounding. Thanks"