The input of the splitter is red, and so is output #1. This is for using a PI with a splitter between it and the SWiM. You can't/would never use 2 PIs. If you connected a termination to a port that had DC, it shorts out the DC and the SWiM loses power. Since you look to have had "problems" with splitters being backwards, you might want to check the "other splitter" to make sure the input goes to the dish/SWiM.