OK so we bought this VW Golf MKIII 1997 to a guy that repaired it after a small accident. The car worked well, at least for the engine part, for around 6 months. We eventually had to change the battery. Unfortunately, after the new battery was plugged in, the alarm started going off.
I searched through the internet for 3 days, and tried pretty much everything I could, including what I found here on this forum. Mainly, it was about disconnecting the alarm box (which on the mk3 of 97 should be a black box). Problem was: we did not have that box. The guy who repaired the car before we bought it, probably did the trick himself (see picture no. 1). Well his trick was working as far as we had to unplug the battery.
I managed to unplug the alarm horn, however, the engine will NOT start. Now everything works fine in the car, including the central lock, the lights, etc...
I have tried the Alarm bypass by connecting the RED wire to the RED/BLACK wire. Did not work.
I have checked the fuses, they're all good.
Sadly I can't try to unlock the door with the key, both the passenger and driver door's locks fell off...
So here, I am really thinking this guy's set-up really is the problem. And we are paralysed without that car working. It's becoming a big issue for all of us here. We would really appreciate any kind of help. If you need any more picture, or have any questions, I'll be glad to answer them asap.
Here's the pictures.