I put the battery in backwards on a 1997 discovery 2.
The horn kept blaring until I disconnected it and realized what I did.

The alternator 100 amp fusible link blew, and the radio 10 amp fuse blew on the inside. I replaced them.

Problem is the vehicle now won't start.
Did I fry the computers? The starter cranks but it won't start. Theres power on the inside like normal.
But anyone know why it won't start? Do I need an OB2 reader?

 

its a discovery 1.
I don't want to take it to the dealership but I think I ruined it.
Any help would be appreciated.

 

Ok. Got it started. Running a bit rough.

 

Good! What else did you find wrong and corrected to get it started? Your info may help others in the future with the same problem.
BTW... Welcome to the forum!

 

First of all I want to thank you for not asking how I did this to myself. It's an embarrassing thing to do. But we all screw up.
Get out your manual and check all the computer fuses, ignition control, everything. I thought I had checked them all but being so many I missed one.
Pretty simple and not as scary as I thought. I will be testing the alternator with a meter in the daylight tomorrow. If the alternator isn't fried landrover installed some good safeguards.
After the computer adjusted to not having any power after about 5 minutes, it stopped running rough.
I'll keep you updated but I think it's fixed.