My guess would be you are installing the incorrect size bulbs.
pictures of how to change front signal bulbs on a 2004 grand prix pontiac
To replace a turn signal switch on a 2003 Pontiac Aztek, also known as a flash relay, the steering column must be removed. The flash relay is located under the turn signal. Remove the mounting hardware and the unit can be taken off.
HOW DO YOU GET THE LEFT TURN SIGNAL BULB OUT ON A 2000 PONTAIC FIREBIRD
replace cam position sensor
On my 2001 it is part of the Hazard switch. You have to replace the entire switch on a 2001.
raise the hatch pull down on the carpet, determine which light is out and twist to come out, you dont replace from the outside of the car!!!
underneith the front bumber twist counter clockwise replace bulb
take the light off and put the other one in you jack@$$
how do you remove the turn signal assembly on a 1989 Pontiac Bonneville
Remove the panel under steering wheel. There will be 2 flashers. Replace one on right.
pull the lining of the trunk away from the back of the trunk
Remove the plastic piece under the steering wheel... it is hidden in there. The one behind the radio is for hazards