oh my god i cant believe this but thank you, i just typed in a very through explanation of this and went to post it and i was longed out when i longed back on it was all gone i not doing it again but yes all wires going in and out of splitter are hot. the ones coming out are all fuse links that if they just get hot they can become brittle and break inside the insulation with no visible sign. all of the wires coming out the splitter ar about 10" long and hook back into the real wiring harness with a piece of glue filled heat shrink tubing and should be replaced from the batt with the same size wire that they go to after the heat shrink (10ga or 12ga) with a buss fuse or equivalent in them of the right rating (10a 15a) my 93 ram had one orange fusible link broken inside in several places but looked fine. this was the power windows and heater / ac fan not working. this is a little more through explanation. thank you though this site saved me a lot of time diagnosing this i hope this further helps some one else.
< this is a link to the photo that i got here. i hope im doing this all right, if not yell at me then. Over.