2. Yes, from fuse 7, power is only fed to the nozzles when it is cold.
3. 3rd wire is for hose heaters, not used in all country markets.
4. Black box is a thermal switch, heaters operate at 12 volts.
Wiring diagram going to you by PM, it is copyright so I can't post it publically
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)