The write up was correct information about how to install the solenoid and filter package and got off track asking questions.
Check out post #11 of this from Doug's site: http://forums.gogodiesel.com/showthread.php?17402-GoGoDiesel-Modified-Direct-Clutch-Solenoid
Then someone needs to tell...
Third brake light usually runs on a separate circuit from the two rears. Check bulbs, fuses, switch, then dig deeper. Mine likes to blow bulbs at random anymore.