one wire of your cap should go to the wire labelled "277/ cap" connecting to the ballast (just 2 wires together)
the other wire on the cap should goto the ignitor "x2/com", the common wire going to the ballast "com", and the white wire going to the lamp (4 wires together)
however, do not take my advice if you don't have an ignitor..i've never wired my own without ignitors and bad things might happen
