I just changed my socket on the drivers headlight a few weeks ago. It had the same problem as you discribed. Look at the end of the plug, mine was discolored and looked like it had seen some heat.

I picked up a plug at autozone i think it was 6 or 7 bucks.

You should solder the wires and use shrink tubing to seal the conections. That way you won't have future corrosion problems.

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82 Rabbit diesel (first d), 84 Jetta turbo d (300k when sold), 83 240d (305k when sold), 84 F250 6.9d w/Banks turbo(parts truck), 86 F250 6 cyl.gasser(waiting for 6.9d), 84 300d ( 347k Sold 8/04), Y2k New Bettle TDI (185k miles), 95 740IL (wifes), 87 300TD (206k Sold 7/05), 05 Passat TDI Wagon