Alright so when I drove my datsun with bad(really bad) brakes when I put the brake pedal down all sorts of clicking noises came from under the passenger side of the dash, like a relay only really fast. But now that I fixed the brakes that doesn't happen anymore. But when the key is in the "run" position, and while it is running, there is a relay click sound every ten seconds, under the dash on the passenger side, it sounds like its coming from this cluster of relays. I also hear a relay click every time I hit the horn. My question is, do all 260zs make this many relay cluck sounds or is there something wrong? If its normal, then fine but if its not, then WTH?

Mine doesnt do that. My clock does make a clunk sound about every 10 seconds but its really difficult to hear

No relay clicks in my early 260, but that may not be of much use. Mine, at this time, is running but I have virtually no power to the dashboard yet. May be a clue there.

Alright so I do need to be concerned. What about when you hit your horn? Does a relay click then? I actually wasn't getting proper power to, where when converting to a internally regulated alternator the sense post is supposed to hook up. I suspected the amp gauge to be the culprit but it could linked this clicking relay.

Get yourself some 1/4" tubing from Home Depot. Hold one end up to your ear and probe the various areas under the dash to isolate where the click is coming from.

My '87 Hardbody was clicking awhile back. I cleaned all the ground connections and it stopped. http://atlanticz.ca/zclub/techtips/electricalconnections/index.html