Why are my dashboard lights flashing? Also when this is happening my speedometer and rpm gauge flicker. Is it a computer or electrical problem?
If you mean the lights are pulsing in intensity the trouble is most likely due to a problem in the alternator. There may be some bad diodes inside it. You can have the output checked out real easily at a shop. The battery condition should be checked also.
Do you really expect an answer after offering such little information? What is the year, make, and model of the vehicle in question?
“Is it a computer or electrical problem?”
Yes.