Need help with '99 2500 Dodge Ram alarm going off. Truck won't start. No FOB.
We recently bought a '99 Cummins Diesel 2500 Laramie Ram. My mother in law went to start it while we were out of town, and she said it wouldn't start and that the alarm started going off. We don't have the FOB, but the alarm eventually stopped on its own.
When I went to start the truck a week later, the alarm went off when I opened the door and the battery was clearly dying (no lights, wipers crawling across the windshield). I charged the batteries to full charge, but the alarm seems to have some sort of immobilizer because nothing happens when I turn the key to start it.
I don't believe it is an aftermarket alarm, but I don't know for sure.
I did some googling with little luck, and I don't know much about cars, not at all to be honest. So I turn to you Dodge Enthusiasts! Any advice?