I would have loved to use a proper harness, but there isn't one for the 9-5 with the OE satnav. There's one for fitting a new unit in place of the radio. The connectors are completely different.
The Kenwood unit has alternate speaker outlets. There are eight speaker wires via the ISO, but they are no good for the existing amp, so I used the other set of pre-amp outlets rated at 2volts, which work with the existing amplifier. So eight of the connectors are ones that would be there anyway. Straight crimps would be neater, but I would have had to cut off the original connectors. I didn't want to do that, just in case it all went wrong. But it's an option for today if the space is tight.
There are 17 wires to connect....
8 "speaker" pre-amp wires to amplifier
Battery
Ignition
Lighting
Aerial trigger
Earth
Radio aerial
DAB Aerial
Microphone
iPod/iPhone/USB lead.
So do the scotchblock connected wires end up in the ISO connector to plug in the headunit?
I'm still thinking of a way to make a 'proper' harness to plug it in rather than scotchblock!
It's not as bodged as it looks. The blue stuff is either insulating tape securing the push-fit RCA/phono connectors, or blue masking tape labelling all the connections.