The "30" on the relay is usually the output- 87 is the source, and 85 and 86 are the trigger/ trigger source. Go to
www.fbirides.com, and at the bottom left of the page is "Installation Guides". There's a pdf file for several different wiring configurations.
The key when hooking the relay to your remote unit is knowing whether the output of the brain is positive or negative. Make sure of this before you hook it all up!
-Phil at FBI