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Old 03-11-2010, 06:15 AM
2 posts, read 9,593 times
Reputation: 14


Okay, so my Mom's Buick had a left rear turn signal out. I replaced the bulb. Since we had everything open back there, I went ahead and replaced the right rear turn signal bulb, too.

The left signal went back to working fine. The right one started to malfunction slowly. Sometimes it would work, other times it would flash fast like the bulb was out.

After a little while (a week or two) I chanced the right side bulb again.

The right side started to work fine, but the left side started to malfunction...sometimes it would work, other times it would blink fast as if the bulb was out. (sometimes within the same use... we could be sitting in a left turn lane with the blinker on and it would start off fast, and then start working before we made our turn). Now it has been about a week and a few days since I replaced the right side bulb and the left side almost never works.

I will be triple checking to see if it's possible to but the bulbs in backwards, but it appeared to be impossible... like the bulb was made to work either way you put it in. A friend has suggested that it might still be possible to put the bulb in backwards and I should check one more time. If i did get it in backwards, then it's working with the filaments switched... when we use the blinker it's working off the break light filament and vise verse. That would make sense because the bulb would burn out faster since it's not being used correctly, but since I was already concerned about this and checked it out, I will be surprised if that is the case. I am going to check it again anyway though when I go over to my mother's today.

Has anyone got any other suggestions?
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Old 03-11-2010, 10:47 AM
Location: Pomona
1,955 posts, read 5,431,092 times
Reputation: 1417
Dirt or corrosion on the contacts on the bulb holder could do things like that. Unplug the bulbs and check them.
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Old 03-11-2010, 11:33 AM
Location: North Beach, MD on the Chesapeake
16,842 posts, read 16,628,873 times
Reputation: 16376
Have you checked the flasher module in the fuse box?
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Old 03-11-2010, 11:41 AM
Location: Michigan--good on the rocks
2,544 posts, read 2,146,355 times
Reputation: 1892
Good suggestions both. I would tend to start with making sure the contacts are clean and not bent. Then check the flasher, and next the ground.
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Old 04-19-2010, 08:45 PM
2 posts, read 9,593 times
Reputation: 14
Thanks everyone! Removing the bulbs, they looked clean and unbent... but I put some electric grease in there and they've been working for weeks!
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