Turn Signal Testing

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Turn Signal (indicators) problems?

Specific bulb doesn't light up

Remove the lens and twist the bulb out. Inspect it for:

* broken filament
* Loose glass 
* Corrosion of socket

Clean any corrosion with a wire brush and contact cleaner like Deoxit spray. Be sure to clean the bulb contact metal as well as the light socket.

Replace any damaged bulb.

One Side Flashes

The right & left sides are semi-independent. If one side works OK, but the other doesn't, then the Flasher Unit is good, but a bulb or wiring for that side is bad.

Verify that all three bulbs on the side are OK.

• Front t/s lamp
• Rear t/s lamp
• dash t/s lamp

Replace any damaged bulb.

Indicators Flash Slowly

The flasher units are load-dependent. So if the load is not correct -- for example, if one of the three bulbs is burned out -- it will not operate correctly.

See section above on checking the lamps.

If the problem continues, follow the "Does Not Flash" section below.

Indicators Do Not Flash

The flasher units are load-dependent. So if the load is not correct it will not operate correctly.

• One bulb burned out. See above section.

• Flasher unit is incorrect part number. Most flasher units look identical, so check the Part Number on the flasher, and replace if it is the wrong type.
  • For the Datsun 1200:

    T/S flasher unit: 25520-89901

    Hazard flasher unit: 25520-89990

  • For a more detailed list of compatible parts, see Turn Signal part numbers.

• Flasher and Hazard units are swapped. Check the part numbers and swap them around correctly. See Flasher Location

  

• Flasher unit is broken. Test it.

• Wiring problems. Trace it using the Wiring.

Fuse Blows

Fuse blows when T/S lever is activated left or right. Possible causes include:

• Incorrect fuse. For a Datsun 1200, the T/S fuse is the 15A Hazard/Horn/Stop fuse. If a smaller fuse is installed, replace with the correct 15A size.

• The t/s switch (which is inside the steering column) may be loose. Tighten the switch, replace the fuse, and test again.

First Checks

Troubleshooting