Turn Signals – Common Problems and Repairs

Overview

This guide addresses two common turn signal issues on the Porsche 944 (16v engine): a turn signal that blinks faster on one side and a turn signal that lights up but doesn’t blink. These problems are typically caused by dirty bulb contacts, a bad bulb, or a faulty flasher relay. Proper diagnosis and repair ensure your turn signals function correctly, maintaining safety and compliance with road regulations.

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Tools Required

• Wire brush
• Emery cloth or fine sandpaper
• Dielectric grease
• Flathead screwdriver
• 10mm (3/8 inch) wrench or socket

Parts Required

• Turn signal bulb (21W, single filament, amber) – N0177322 (if replacement is needed)
• Flasher relay – 94461511701 (if replacement is needed)

Step-by-Step Procedure

Step 1: Diagnose a Rapidly Blinking Turn Signal

1. Identify the side where the turn signal blinks faster than normal (e.g., left or right).
2. Locate the turn signal bulb sockets for the affected side. For the Porsche 944, these are found in the front and rear light assemblies:For front turn signals:
   Access the bulb socket by removing the lens cover with a flathead screwdriver, located in the front bumper.
   For rear turn signals:
   Access the bulb socket via the rear light assembly in the trunk, removing the 10mm (3/8 inch) nuts securing the assembly.
3. Remove the turn signal bulbs from their sockets by twisting counterclockwise and pulling out.
4. Clean the bulb sockets using a wire brush to remove corrosion or dirt.
5. Clean the bulb contacts with emery cloth or fine sandpaper until shiny.
6. Apply a thin layer of dielectric grease to the bulb contacts to prevent future corrosion.
7. Reinstall the bulbs by inserting them into the sockets and twisting clockwise to lock.
8. Test the turn signal to confirm it blinks at the normal rate (approximately 60–120 blinks per minute).

Step 2: Diagnose a Turn Signal That Lights Up but Doesn’t Blink

9. Turn on the turn signal and note whether one side lights up steadily without blinking or both sides fail to blink.
10. If only one side is affected:

Access the bulb socket for the affected side (see Step 1, instruction 2 for locations).
Remove the bulb and inspect it for a broken filament, visible as a disconnected or burnt wire inside the glass.
If the filament is broken, replace the bulb with a new 21W amber turn signal bulb (N0177322).
Reinstall the bulb and test the turn signal.

11. If both sides light up but don’t blink: Locate the flasher relay, found under the dashboard near the fuse box in the Porsche 944.

Remove the flasher relay by pulling it from its socket.
Replace it with a new flasher relay (94461511701).
Test both turn signals to confirm they blink correctly.

Post Procedure Checklist

• Verify that both left and right turn signals blink at the normal rate (approximately 60–120 blinks per minute).
• Check that all bulbs illuminate brightly and consistently.
• Ensure no dashboard warning lights related to the turn signals are active.
• Inspect bulb sockets and lenses for proper seating and no signs of corrosion.

Sources

• Clark’s Garage
• Pelican Parts
• Porsche 944 Workshop Manuals
• Youtube