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Tagging the wall warts is a good idea.
If this is a transformer-style cord (the ones that you power small electronics with), the other thing you need to make sure of is "barrel polarity." You need to find out whether the barrel (the shiny outer part of the plug) is positive or negative.
There is usually a diagram on the device (and on the plug) that looks something like this:
+ -------C.-------- -
imagine that the period is a dot that's somewhat enclosed by the "C". This means that the barrel is positive and the "tip" is negative. Some universal adapters have tips that you can flip around on the cord to reverse this polarity.
Hope this helps!
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