That's perfect Ingenieur, thanks! I'm working on getting Carly or Rhienhgold, but in the interim I'd like to keep going if possible with some diagnostics.
If I go through through the items on that circuit, replace the fuse and start unplugging the items one by one to see if the fuse doesn't blow, am I going to get myself in trouble? I don't believe it's the scr that's the running issue. I know the person I bought it from told me the scr want working properly. It drove great when I bought it, now it has a really rough idle and went into limp mode once.
I think the transfer pump might be the culprit? I checked the service history on the vehicle and the active tank was replaced in December of 2015. It shouldn't be an issue after just a year and a half? At least, I hope not!
Is the transfer pump from the passive tank to the active tank under the passengers side floor in front of the air suspension compressor?