Turn signal bulb broke in socket.

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This is for turn signals. Get at the turn signal switch. See the purple wire, L terminal on top of turn signal switch in diagram, that should go hot with key on, use jumper wire from that terminal to one of the wires on bottom of turn signal switch in diagram, those are, front/rear, left/right turn signals. If the turns signals work properly with the jumper, but, other wise don't, the problem should be the turn signal switch. If it still doesn't work properly, you would have to check wiring circuits.
Sometimes a faulty ground can cause weird problems. Sometimes the bulb doesn't make good contact in the bulb socket? Try putting a little pressure on the bulb in the bulb socket, see if it starts working?

1994 was the mark viii. here is what you need to do.

Lens/Bulb, Turn Signal-Rear

Removal and Installation

To remove the plastic socket, turn the socket counterclockwise to the stop, and remove the socket. Remove miniature bulb from socket. Install miniature bulb in socket. Index the smallest tab for locating the three locking tabs, then press the socket into the rear lamp and rotate clockwise to the stop.

1. Remove retainer (unscrew) attaching the luggage hold down net and luggage compartment side trim.

1. Pull trim down to expose the lamp attaching nuts

1. Hold rear lamp in place and remove the three attaching nuts.

1. Pull rear lamp away from vehicle far enough to remove the two lamp socket and wiring (13410) and remove the rear lamp .

1. Replace miniature bulbs , if necessary.

1. To install, reverse Removal procedure. Tighten nuts to 5.2-7.2 Nm (46-63 lb-in

Peel back the trunk lining to reveal three wing nuts. Remove wing nuts to pull lens cap away from car. To remove bulb socket push on the rectangular button (the release) while pushing on the end of the socket to unlock and spin counter clockwise to release. pull out old bulb and reinstall lens cap.

Parking, Side Marker & Tail Lights

1. Remove the lighting assembly from the bodywork.
   
2. Disconnect the bulb and socket from the lighting assembly.
   
3. Remove the bulb from the holder.
   
4. Reassemble in reverse order of the removal procedure.
   

Rear Turn Signal, Brake & Parking Lights

1. If necessary for access to the bulb socket, remove the rear trim panel, by depressing the clip at the top or the bottom of the panel. Once the clip is depressed, pull the panel away from the surrounding panel.
   
2. To remove the bulb and socket from the cover housing, grab the socket body and press towards the cover housing slightly, then turn counterclockwise until the bulb and socket are free of the cover body.
   
3. To remove the bulb, depress the bulb slightly and turn it counterclockwise to release it from the socket.
   
4. To install the bulb, carefully push down and turn the bulb clockwise at the same time.
   
5. Insert the bulb and socket into the cover housing opening, and turn the socket body clockwise.
   
6. Install the trim panel if necessary.
   

Remove the two bolt covers on the rear pillar by prying on the bottom edge with a flat-tip screwdriver.
Remove the bolts with a Phillips head screwdriver, and remove the light assembly from the rear pillar.
Determine which of the two bulbs is burned out: turn signal or brake/taillight.
Remove the socket by turning it one-quarter turn counterclockwise.
Remove the bulb by pulling it straight out of its socket.
Push the new bulb straight into the socket until it bottoms.
Test the lights to make sure the new bulb is working.
Put the socket back into the light assembly, and turn it clockwise to lock it in place.
Install the rear light assembly in the rear pillar. Tighten the two bolts. Snap the bolt covers into position.

Hope this helps you.

PLEASE DON'T FORGET TO RATE!!!

Rear Turn Signal, Brake, & Marker Lights

1. Disconnect the negative battery cable.
   
2. Open the trunk.
   
3. Unfasten the nuts or other retainers from the rear trim.
   
4. Unfasten or release the housing cover retainers.
   
5. On some vehicles, you may have to remove the rear fascia/body panel and light assembly to get to the sockets.
   

On some vehicles, such as this 1986 Grand Am, you must remove the rear body panel with the lamp

Depending upon vehicle application, remove the lamp socket either by rotating it counterclockwise (approximately 1/4 turn) until the plastic tabs disengage, or by squeezing the metal tangs while pulling the socket from the light assembly


Remove the lamp socket assembly by turning it counterclockwise, then pulling it out

Generally, side marker lamps use small bulbs with flat, blade-type bases, and tail lights/turn signals use larger, round-based ("bayonet") bulbs.

1. Remove the bulb from the socket using the appropriate method. Bulbs with blade-type bases pull straight out, while those with round bases and protruding pins (bayonet-type bulbs) must be depressed, then rotated counterclockwise (approximately 1/8 turn) before pulling out.
   

Remove the side marker bulb from its socket by pulling straight out

To install:

1. Secure the bulb in the socket using the appropriate method. Bulbs with blade-type bases push straight in, while those with round bases and protruding pins (bayonet-type bulbs) must be inserted, then depressed and rotated clockwise (approximately 1/8 turn).
   
2. Install the lamp socket using the appropriate method. Depending on the type of socket, either engage the plastic tabs, and rotate the socket clockwise (approximately 1/4 turn), or push on the socket until the metal tangs engage.
   
3. Install the housing cover nuts.
   
4. If removed, install the rear fascia and light assembly.
   
5. Install the rear trim.
   
6. Connect the negative battery cable, then check the operation of the rear lights.
   

HEADLAMP BULB REPLACEMENT

REMOVAL PROCEDURE

CAUTION: Halogen bulbs contain gas under pressure. Handling a bulb improperly could cause it to shatter into flying glass fragments. To help avoid personal injury:

• Turn off the lamp switch and allow the bulb to cool before changing the bulb.
• Leave the lamp switch OFF until the bulb change is complete.
• Always wear eye protection when changing a halogen bulb.
• Handle the bulb only by its base. Avoid touching the glass.
• Keep dirt and moisture off the bulb.
• Properly dispose of the used bulb.
• Keep halogen bulbs out of the reach of children .

NOTE : Avoid touching the bulb or letting the bulb come in contact with anything damp. Oil from your skin or moisture on the bulb can cause the bulb to explode when the bulb is turned on. If either comes in contact with the bulb, clean the bulb with alcohol or a suitable degreaser and wipe the bulb dry.

1. Open the hood.
2. Remove the headlamp. Refer to Headlamp Replacement .

1. Remove the access cover from the rear of the headlamp.
2. Disconnect the electrical connector from the socket.
3. Rotate the bulb and socket counter clockwise in order to remove the bulb and socket from the housing.
4. Disconnect the electrical connector from the socket.
5. Remove the bulb and socket from the headlamp.

INSTALLATION PROCEDURE

IMPORTANT :

• Replace a high beam bulb with another high beam bulb. The high beam bulb has a black socket.
• Replace a low beam bulb with another low beam bulb. The low beam bulb has a gray tip and a grey socket.
  
  1. Position the bulb and socket to the headlamp.
  2. Connect the electrical connector to the socket.
  3. Install the bulb and socket to the housing by rotating the bulb and socket clockwise, locking the retaining tabs to the housing.
  4. Install the access cover to the rear of the headlamp assembly
  5. Install the headlamp

REMOVAL PROCEDURE

1. Open the hood.
2. Remove the headlamp.
3. Rotate the bulb and socket counter-clockwise in order to remove the bulb and socket from the housing.
4. Remove the side marker bulb (3) or turn signal/park bulb (4) from the socket.

INSTALLATION PROCEDURE

1. Install the side marker bulb (3) or turn signal/park bulb (4) to the socket.
2. Wipe the bulb with a clean cloth to ensure the bulb is free of any dirt or oil.
3. Install the bulb and socket to the headlamp by rotating the bulb and socket clockwise, locking the retaining tabs to the headlamp.
4. Install the headlamp.

Your front turn signal socket is shot. Buy a new one at the dealer for about 30.00. It will fix it. You may be able to clean it and wiggle it to get it to work. But it wont last very long. I had the same problem. Replaced the socket and it is fine. Note: If one side is bad the other side it not far behind. Probably 2 or 3 months it will go also. Good Luck.
Bill

Rear Turn Signal, Brake and Parking Lights 1984–89 VEHICLES

1. If removing an inner bulb, remove the license plate. For outer bulb replacement, reach from under the vehicle.
2. To remove the inner rear brake light, you must reach behind the license place and under the vehicle to access the bulb and socket
3. Remove the socket from the lens by releasing the locking tab and twisting
4. Once the bulb and socket are pulled from the rear of the lens, grasp it from behind the license plate opening
5. Then, pull it out of the side and replace the bulb
6. Remove the bulb from the socket and replace.
7. Installation is the reverse of the removal procedure.

UNSNAP BLACK PLASTIC UNDERNEATH FIXTURE.REACH IN AND TWIST SOCKET TO REMOVE. PULL SOCKET DOWN AND REPLACE BULB. REVERSE STEPS TO REINSTALL. THIS IS ALL DONE FROM UNDERNEATH CAR.