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Old 03-18-2018, 07:50 PM   #1 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Ghost fixes lightbulb

Every once in a while something on my car will fix itself. That seems to have happened today.

For years I've been waiting to fix a left front turn signal problem. So today I have the bumper cover off and the light fixtures out to possibly replace the bulb. Inside the Civic's side marker light bulb are 2 filaments. With the light bulb plugged in and out of the headlight fixture I tested it again. The directional filament would not light up under any conditions and caused the parking light filament to intermittently shut off whenever I turned on the left turn signal. Hazards also worked improperly.

I did a "known good" test by swapping the left front turn signal bulb with the right front turn signal bulb. I didn't do anything else. I didn't clean anything or detach and reattach anything other than the bulbs. Suddenly both light bulbs worked normally. Then I put them back in their original places. And the bulb that has been failing consistently for two or three years of daily diving started working completely normally.

I am guessing that in removing the bulb I cleared some kind of minor corrosion or dust/dirt (the bulb housing was coated in fine road dust).

I suppose it might also be an intermittent open in the wiring.

Or a ghost in the machine.

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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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