http://forums.tdiclub.com/member.php?u=67035kwgilpin, got the Webasto installed yet?
HTHduncgee said:Webasto red and black heavy wires in one wrapping. - Between fuse 25 and the heater fan. (Red to heater fuse and black going to heater switch)
I cut the existing wire going to the heater fuse (fuse 25. The wire color is black with light blue tracer) and joined the red to the fuse side of the cut wire and the black wire to the other end of the cut wire.
There was not much spare wire between the fuse and the wrapping of the harness and because of this I had a failed connection. If doing another one I would pull the wire from the terminal behind the fuse and connect the black Webasto wire to this end. I would then fit a new length of wire going from fuse 25 to the red Webasto wire.
Probably a different type of terminal is needed to fit the fuse and stay in the car fuse block.