Alarm sounds for no reason

see if this link helps you.
https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=Location+of+glow+plug+relay+2002+tdi+beetle

check door switches remove 1 at a time and unplug it once you find the bad switch lights will go out
un plug 1 at a time

May be there is a disconnection on from the battery to the horn as you were replacing it

Hey thaniks for the chat i think that you did not end the session so please give the session a rating ok best regards michael

Take it back to the shop...where you got the alarm installed, and if it's factory, take it to the dealer..Your sensbilty sensor is too high..they need to turn it down...

sounds like a microswitch in your driver door is failing

Count the shifts. It sounds like you are going into overdrive and staying there. Overdrive is too long legged to pull most hills unless you are really flying.. good luck

after maket alarm will help the range and give u option to auto start the car to it is way better way to do keyless and longer range and cheaper

the factory fit alarm is not voltage sensing .The best advice is to go to VW garage and get them to read the alarm causes,(they can check the last 4).this will give you a good idea where the fault lies.ie door lock mechanism,interior monitor etc..You cannot start looking for problem until you know alarm cause..

First check your battery and connections.There are two alarm units , your dealer will be able to read the fault codes and advise you on what to do.I don't think it's wise to expose the security of your vehicle on line.