clicking

i have a 93 crown p71.
when i was under the hood listening to it running and just checkin her over, i revd the engine a heard a clicking from the power distribution box. she dont do it every time but sometimes a clicking comes from the box. is this something i should worry about or is this a normal thing???? when im driving the engine dont chatter and i cant hear any clicking, its only when i rev it.

Well, since I don't know which relay it was, I can't say for sure if it's normal or not. I can say that there are two relays that will "click" when the throttle is wide open, they are the A/C and Alt cut-out relays. This is done to remve load from the engine during high demand situations.