If no battery is inserted in the charger there shouldn’t be a light blinking.

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Answer Title: Can I take my Coolpix camera overseas on a vacation?
Answer Link: http://support.nikonusa.com/app/ans...

Nikon Digital SLR cameras have an auto switching (from 100v to 240V 50hz/60hz) battery charger that will work in most countries around the world. A/C adapters have similar characteristics. Always check the specification plate on your other battery chargers or A/C adapters as third party products may not support dual voltage systems. We do not suggest the use of third party battery chargers and A/C adapters with Nikon equipment.
Note that the cord included with the Nikon charger or A/C adapter is designed for 110 volt use only. A power cord suitable for the local power system should be obtained on arrival, most airport shops and computer suppliers will carry these items which are typically used for laptop conmputer power supply connections. Be sure that the new cord you buy fits the Nikon adapter you wish to use it with and that it is rated for the voltage in your new location. While not recommended, a simple plug adapter may be used, but caution should be taken as the cord Nikon supplies is not rated for the higher voltage and may heat or fail.