Technology has me stumped.
My mother has a second-hand Mazda 121 and, since she doesn't drive much any more, the battery went flat. So I removed it, charged it and had it tested - it's OK. However when I put it back in the car alarm went berzerk - and keeps going berzerk until I disconnect the battery. Before this I hadn't even noticed there was an alarm! We have never used it and before this it's never made itself obvious. What I have found is a big horn speaker (which, yes, I should have noticed earlier), a switch to detect when the bonnet is up and a little red LED on the dash. I can see that extra wiring has been added to the loom but I has been done very neatly and the who lot wrapped in tape so it's impossible to see the extra wires. Some certainly goes through the firewall under the dash but I couldn't see where it goes, except to the light. I couldn't locate the control unit and don't know what it should look like. I've looked through the cabin for anything like a switch but found nothing.
So I'm stumped. Does anyone have any sort of clue what I should do next. Petrol and a match does seem a bit drastic
.