Confused about radio alarm contact

[GromitInWA]

I recently installed an after market head unit and did nothing to the alarm contact or wire that goes into the radio harness. When the car locks, I get a single beep (which I expected based on what I read.) It sounds like the recommendation is to cut the blue/brown alarm wire and ground it. Would it not be better to create a raised pad on the side of the new head unit that will press the alarm contact? I figured that I could super glue a rubber shim to the side of the radio.

[Richard Hamilton]

On the Porsche radio cage, it grounds the contact when you remove the radio. You need to isolate the wire to stop the beep.

[GromitInWA]

Thanks Richard. So I want to cut the wire and insulate the end rather than ground it?

[roadsession]

Thanks Richard. So I want to cut the wire and insulate the end rather than ground it?

correct

[Loren]

I just put heat shrink over it or a couple layers of electrical tape - no need to cut wires.

[GromitInWA]

@Loren - you put that over the spring contact on the left side of the receptacle for the radio? Sorry to be so dense about this...

[Loren]

@Loren - you put that over the spring contact on the left side of the receptacle for the radio? Sorry to be so dense about this...

Ok - now I am confused... is this a CDR-220?

[GromitInWA]

It is a CR-220 (rocking a tape deck)

Here is a picture of the side of it, the red circle is around the pad.

And here is the view of the spring contact in the dash. The red arrow point to what looks like a detached connector, which I had not noticed until I looked at the photo.

[Loren]

The blue/brown wire cutting and taping will do it on this model.

Sorry for the confusion.

[GromitInWA]

Thanks!