I want to replace a PIR detector with a door sensor. I have bought a 6 way anti tamper junction box which I have wired the six wires in:

Red to spare terminal / Black to another terminal

Alarm 1 and alarm 2 to spare terminals - which are then connected to the door contact

Tamper 1 and tamper 2 to tamper switch

My question is - do I need to remove the power cables box to the main control box or can I just leave them connected to blank terminals?

I have a problem that the other pir detectors are not showing the usual red LED once I removed the old detector - I cant understand why there should be a power problem?

I have just tested with a voltmeter and it appears that there is only 0.5volts flowing through, and the fuse has blown!

Edited January 11, 200521 yr by spbaldock

You have probably blown the 12v aux supply fuse when removing the wires from the old pir.Just make sure the red + black are secure and separate.

Thanks for responses - obvious once I put the multimeter on! The fuse is a 1.6amp - presumably I need a quick blow of same ampage?

Also, once I replace the fuse, can the existing power cables be left at the junction box, or will I have to remove from the main control panel - which is the easiest option!

Thanks - I wish I had! Still, you've got to learn somehow...

I will get the new fuse tomorrow. Apart from avoiding getting an electric shock, is it just a case of removing the old and putting the new in? Can I just remove with a pair of inslated grippers?

As it's only 12VDC you can pull it out with fingers. I'd remove the mains supply to the panel first to avoid inadvertantly being able to get an electric shock.

To be completely safe you could also remove one of the battery leads before commencing. This will probably cause the external sounder to sound but should stop as soon as you've replaced the fuse and re-applied power.

dont pull both the mains supply and back up as this could lead to the system losingALL the detectors and codes and so on.knock mains off at the fuse box if you are worried about it.prepare for some bells a ringing as well!!

dont pull both the mains supply and back up as this could lead to the system losingALL the detectors and codes and so on.knock mains off at the fuse box if you are worried about it.prepare for some bells a ringing as well!!

If it does it means your systems knackered and needs replacing, ideally.