UPDATE: I finally got an opportunity on a day without rain to remove the alarm horn. Here are some notes for anyone else who has to tackle this job. I read somewhere that the bracket is held to the body with rivets. So I drilled what I thought was the head of the ‘rivet’. This took quite some time.
Once I’d done this, I discovered that in fact there are two captive nuts attached to the car body. The alarm is held on by two bolts that have no hex or slot on the head. These bolts were held in place by a lot of blue thread sealant.
If I knew these were bolts before I started, I might have tried to cut a slot in the head of the bolt to unscrew it. Once the bracket is off the car, the alarm can be removed from the bracket.
I’d already decided to source another alarm, so it was a one minute job to cut it open with a Dremel tool.
Mine was as described by h100vw. The Ni-MH battery had leaked and corroded a lot of the circuit board.
The captive nuts will make it easy to reattach the bracket.
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