This thread is started as a way to keep info clear and concise in checking a part on the 6.5 that you suspect is bad.
6.2/6.5 Glow Plug Controller (AKA Glow plug relay)
Single big heavy red wire terminal - Should have battery voltage on it all the time.
Double big heavy red wire...
Was working on a Torqshift earlier, and came across this info. Pretty good read on the TS.
http://www.atsg.biz/articles/html/Ford%205R110W%20Torqshift/Ford%205R110W%20Torqshift.htm