If you have only 4 cores to the magnetic contact then you will have to either run 6 core (2 - alarm, 2 - tamper, 2 - 12v power) or use the 4 core but lose the tamper facility. Have a look at www.diy-alarms.co.uk for loads of info.
lee
February 2008
I can answer this question...
i have window magnetic blocks i wish to change to pir?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home alarm systems.