If you mean that all your lights are pulsing from their usual brightness to slightly dimmer then back, then this is usually a sign of bad voltage regulator in your alternator. Most alternators no longer have an external regulators so alternator needs to be replaced. To test this turn on your lights and pay attention to how fast your lights "pulse". Rev the engine and if the pulsing speeds up then its your voltage regulator.
If you meant that a specific light keeps blinking then please specify which and during what conditions, and we can try and get it figured out.
Hope this helped.
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