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Thanks for the info. I can use the meter fo find the contact pair (open/closed circuit when magnet brought near). How do the tamper connections work and thus how do I test them? I assume maybe by a process of elimination the remaining two will be tamper? It would still be useful to know how...

I have bought a house alarm to install. I bought extra window contacts for UPVC windows. These come sealed with a 'flying' 4 core lead. I understand the theory of basic electricity but don't have much practical knowledge. Firstly, which of the 4 colours connect to where (alarm and tamper)...