Replacement Alarm Sounder / Klaxon?

[MikeP]

Hi,
I have a 2000 registered 1.9 Z3 with a "dead" alarm sounder / klaxon.
I have removed the old unit and can see from the markings on the outside that it is fitted with a Ni-MH re-chargeable battery which is probably dead after 25 years.
The unit has a part number 8383 154 12 HW09 printed on the outside however my local BMW dealer doesn't recognise that number.
The correct part number for my vehicle is apparently 65739416246 (superseded by 82929404857) but these are no longer available.
There are plenty of replacement units on eBay but the likelihood is the batteries in those will be knackered too.
I thought about possibly replacing the batteries but although the unit has 3 screws in the back the casing appears to have been glued together and refuses to budge.
Has anyone found a suitable alternative?

 

[Althulas]

Do you mean the screws will not budge? Just drill them out or just the heads. You can silicone the case back together.

 

[MikeP]

Hi,
I can remove the screws but the case seems to be bonded together so not much chance of opening it without significant damage.
I have had an offer of a couple of old units from another member (Thanks Brian !) so hopefully I can create one good unit from the parts.
I will post here if I have any success
Any other suggestions in the meantime will be gratefully received

 

[Althulas]

Try a heat gun to see if it will loosen up the adhesive otherwise use dremel it open and seal back with silicone.