Car Standing-Battery Dying-Kill Switch

[IchBautAuto]

IF your alarm horn is fitted, what impact will disconnecting the main battery have on the Alarm battery? I don't know the life of the charge is meant to be long or short but for all of us that had / have old (original) batteries, it could mean that you have no alarm capability should anyone try and pop the door.

[Shoppinit]

Good point. And will it not go off if you lock the doors then disconnect the battery?

[HPsauce]

Your alarm is usually triggered by a signal from a control module, with the battery disconnected that's not going to happen.
It's not set up the same way as a house alarm which has various anti-tamper mechanisms.

[Shoppinit]

It's about as loud as a digital watch alarm anyway. I was surprised to see mine go off the other day when I was past the open windows. I can't believe the siren is still working!

[Gregstv]

Mine is still going as well. Sounds like a kitten. Makes the same sound when I lock it. Rear bumper is coming off to be resprayed. I will change the battery at the same time.

[anditsoundslikebells]

I only found out about the original alarm when I was fixing the climate unit over the holidays. That was a surprise.
I will also have the rear bumper sprayed at some point.
What battery am I looking to get hold of to replace?

[Shoppinit]

Just received my Dis-car-nects. They look good.

[HPsauce]

I only found out about the original alarm when I was fixing the climate unit over the holidays. That was a surprise.
What battery am I looking to get hold of to replace?

Most Audi alarm sirens are sealed with an internal rechargeable battery.
You can try to get a replacement unit, but it will likely have an old tired battery anyway, or try to cut it open and replace.
Or just live with it as it is.....

[IchBautAuto]

Waiting for gregstv to pop up with the answer

[iaingbrown]

https://www.ebay.co.uk/itm/Single-Twin- ... SwuLZY7L~b

I got this off Ebay - works well. I lock the car on the key with the tailgate open. Reach under to battery and disconnect.Close tailgate. Main faff is re-keying the audio code every time you restart.

[anditsoundslikebells]

ironically my alternator died between starting this thread and now. I assume it had been on its way out for a while, meaning the battery wasn't getting fully charged.
New battery, refurbished alternator.
I'll see how I go.
(I'm still keen on a kill switch interrupting the earth but placed in the spot where the CD player was)

[norwichphoto]

Could use something like this in place of the traditional motorsport style battery isolator switch.

https://www.cartekmotorsport.com/battery-isolators/

Have used these on Formula 3 racing cars and never had any problems.

[Mɐʇʇ]

Thank you. I was looking for that the other day and couldn’t find it. Brilliant bit of kit.
200 quid though!

[Gregstv]

This is the alarm out of the spares car. I fitted batteries to the outside. It's different to the one in my car. Need to do the one in my car now. Cut them open with a Dremel.

[Mɐʇʇ]

I’ve bought a spare one to do just the same