Speedg99 wrote:

Many thanks for the link. I'll pop the wheel off and have a look.
The coupler wouldn't explain why the alarm sounds as soon as I lock the car. I assumed the horn not working and the alarm sounding where linked ?

 Ah!  I wasn't fully understanding the complexity of the problem.  The alarm is sounded with the horns so my logic was that if the horns themselves work and the fuse is OK the rotary coupler was possibly faulty.  I had thought that the alarm sounding when you lock the car might have been the sort of blipping that car alarms used to make all the time when they were armed.  In my '04 TF, there is a fair bit it clicking and the hazard lights do a bit of flashing when I set the alarm.

Read More...