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Old 09-22-2015, 04:06 PM   #1
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Left turn signal problem

Hello,
My wife has a 2005 Ford Focus SES. We recently replaced the front left headlight lamp, but I believe this issue started just before we did that. We replaced it because the old one was really yellow.

So, the problem is with the left turn signal. When left turn signal is switched on, it clicks twice as fast inside the car... the side left turn indicator blinks but the yellow blub in the leadlight lamp does not blink. That same yellow bulb does turn on with the headlights, though, so I don't think the bulb needs to be replaced.

All other lights seem to be working fine.


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Old 09-22-2015, 05:26 PM   #2
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That winker/running light bulb has TWO separate filaments/circuits so one could easily be burnt out while the other continues to work.
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Old 09-26-2015, 01:35 PM   #3
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Thanks. I switched out the bulb and still same problem. Any ideas?
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Old 09-26-2015, 07:58 PM   #4
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Because the winker/running light share a common ground and it's not the bulb, it must be power to that portion of the twin filament bulb. Common problems there are dirty connectors (corrosion or melted plastic inside the connector usually) or intermittent wiring connections in the harness near the connector (stress breaks or frayed connections, for example.)
Do a "wiggle" test first; wiggle the bulb connector and wiring to it with the ignition on and turn signal working. If you can get it to work, you have a loose or corroded connection.
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