I ended up figuring it out and wanted to post the solution here to aid anyone else who might run into this problem. So when I changed the battery I tripped the genuine OEM trademark 1985 Volvo anti burglary system. Apparently the only way to deactivate this system is with the accompanying key fob. B...

Hello, I have a 1986 740 GLE with a dead battery. I changed out the battery but as I started to reconnect it the ancient alarm system started going off. Honestly I had no idea the thing even worked, but now I can't seem to disable the system. I believe it is preventing my car from starting.When I op...