I've just received all the bits to add a new head unit in my 156 and have a query about the wiring harness.
I don't seem to be able to embed images, so I've included a link to my diagram of it here;
: Connects2 lead to convert Alfa's internal wiring to ISO
: Connects2 lead to convert Steering Wheel controls to JVC's input
: Supplied with JVC head unit and connects stereo to cable A.
(Click cable names for more detailed pics of each cable.)
The bit I'm confused about is;
- Cable B has 2 wires coming from it, one with a 3.5mm plug on the end (I've labelled it "2") and one with a generic connector plug on the end (I've labelled it "3").
- Cable C has a loose wire with Steering Wheel Remote written on it (I've labelled it "4").
I assume that Cable B is attempting to cater for multiple possibilities and that I don't need to use both its wires, is that correct?
My stereo doesn't appear to a have a 3.5mm socket for Steering Wheel Controls (there is a 3.5mm aux-in one though) so I assume I have to connect wire "3" to wire "4" and just leave wire "2" hanging loose in the dash, is that correct?
If I'm right, what's the best way to connect wires "3" and "4"?
I suspect either;
a) try to get hold of a male plug that matches the female being used on wire "3"
b) snip off the generic connector and join them together with a terminal block