HELP electrical issue

[HotrodPez]

There is a relay under the passenger seat on my 76 280z. It is zinc in color, and plugs into the main harness. Today it started clicking rapidly, and when it did, the "brake" light on the speedo flickers and the "CHG" light in the voltmeter flickers as well. Nothing else seems to be affected by it. I don't have a wiring diagram for this car, so can anybody tell me what this does and why it started freaking out?

[sblake01]

You can dowload the 76 280Z FSM here.

[HotrodPez]

Thanks, apparently it is the brake warning light check relay, and as far as I can tell it may not be the problem. I think the problem is either the alternator or the voltage regulator.