[Grante]

Like.... how do I get it to work for one? ha.

I have it set up the following way.

 - Eliza Escape (event name)
    -op when
       -op has-time-elapsed
                 70
       -op fire-beam
              GTCV Eliza Battle
              turret12
              GTI Repair Ring


And yes turret 12 is a beam. But when it gets to the time for it to do it.... Nothing.

[TopAce]

Is the Repair Ring within firing range and within firing arc?

[Droid803]

Is the Repair Ring within firing range and within firing arc?

Range don't matter.
(unless you mean the 30km range, though I'm pretty sure it'll fire even beyond that range)

[FUBAR-BDHR]

Has to be in the cone of fire. 

[Spoon]

in my own experience, firing a beam on a subsystem is more reliable than the normal fire beam sexp

[Droid803]

Yeah, targeting subsystems makes the beam much more accurate (because it fires at the subsystem and not at a random vertex or something)
However, it also makes slash beams into direct-fire beams, so watch out for that.