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[jamie]

Kind of puts my "cut red wire"

Hi Hillper

Does your anti theft system still work correctly, with the ignition sense removed form the locking/anti theft interface?  I designed the system to always default  the wiring to the original oem implementation when ignition is off.

(I do remember a Vauxhall TIS bulletin some years ago (last time I had an Omega), and some reference was made to how service Dept's could  defeat the boot system if customers complained, but I cant remember what the method was).

[Hillper]

Jamie, cutting the wire is exactly the same effect as removing the key.  

So, in theory, the alarm should be unaffected as you would normally remove the key before arming it.
The alarm unit would be expecting the loss of the 12v from the 'W' contact as a condition of its operation.

However, I must admit, I have never tested it!  

I'll try it tomorrow, unless someone can do it before then.

[jamie]

Yep, it should be fine, but I wasn't 100% on it, thinking the system may for some unknown reason , expect to see a change on the ign line.  

In fact from memory I think the TIS bulletin from years back, may have advocated a similar approach in removing the ign sense.

[Hillper]

Just tested the alarm.

It works as normal, I'm glad to say!

And by the way, I totally agree with the 'KISS' premise.  It's nearly always the best approach.  It's easy to lead yourself off down a very complicated path, when a total rethink and fresh start provides the best result.