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Gawd, thanks for this - it's a family friend who I understand has done many alarms in his time. This alarm has been operating fine for 16 years so this should be a simple case of replacing the 4 wires - so annoyed I've lost the original photo, have looked through deleted pics too but no luck! I...

 The panel... and the wiring centre... Hope this helps?? Thanks

Hi... OK, today I connected as you mentioned Richard – swapped hold -offs about so red to neg hold-off, black to pos hold-off and no joy. I even tried swapping trigger and return about reverting hold offs to correct colours. I've left as it was with pos hold off disconnected. I've taken photos...

OK thanks, sounds like this is what's happened as I deleted the photo of the rear (siren I replaced) siren's wiring by mistake so copied that of the front one! So sounds like I need to connect  what I have as the tamper rtn (as on front siren) to the neg hold-off, and presumably the neg hold off...

2nd box - one at front, one at rear We have one at front and rear of house - loads of houses do, how can this be overloading? It's been working absolutely fine for the 16 years we've had it fitted - it's only the fact that one siren has corroded that I've needed to replace it.  Do you mean...

Thanks, but I've copied the wiring from the 2nd box -  the only ones that could possibly wrong are trigger and return - black is hold-off, red is hold-on...? 

Hi I replaced an old alarm box/siren yesterday - sea air rusted a few components and it was triggering tamper randomly, a few times a day (or night!). To make sure it was the box at fault I've had the box off for 6 weeks with no problem. I bought a Honeywell 8EP420 - ADE RESON8. I took a photo...