My headphones stopped playing in the left ear when i dropped my ipod but the headphones stopped it from hitting the ground

Double check that the adapter you bought is designed for stereo. The easiest way to check this is count the number of metal bands you can see on the adapter, stereo headphones will have 3 metal bands separated by 2 plastic bands, whereas mono will have 2 metal bands separated by a plastic band.
If you accidentally bought a mono adapter, this will cause sound to only play in one ear.

sounds like a broken wire. have them exchanged.

replace the jack,
cut the wire from the jack then replace it with new one.
remember that the

Tip - Left

Ring - Right

Sleeve - Ground

try blowingout stuff in the connector the may be dirt in there

Before you worry about repair, verify that the balance control in the iPod isn't causing the problem. The easy way to do this is to try some other audio device (home stereo, etc).

Does this still happen with a different pair of headphones? If not, get another pair. If the same behaviour with any headphones you will need to contact Apple if still in warranty to get it repaired.

My bet is with the headphones not the IPOD.

Good Luck

your head phone jack is loose you need to have it re soldered.

headphone jack needs to be resoldered.

The headphone jack on all the apple products have issues (even their laptops). There is no easy fix, other than having the jack replaced, or remounted. A common issue is that it comes loose from the pc board, especially with the movement of the headphone cord. This is a design/functionality flaw.

Hope this helps some.

TWEAK A/V LAB

I recently purchased a Sansa e280 and in three weeks of regular use it developed a similar problem, with music cutting out from playing in stereo to mono, coming out of one headphone speaker. Sandisk tech support told me to reformat the device and install the latest firmware, which I did, but the problem continued and occured more frequently. I have returned the player back to the seller and I shall not be getting another one. A nice Ipod alternative from Sandisk, but from what I have seen written about in forums, the Sansa e200 series appears to be buggey with problems.