The best approach is to trouble shoot the electrical system, and I'm not the guy to explain how to do that to you - someone else will hopefully pick that back up where it's been left off.
I doubt you'll be able to return it - or any other electrical part - after testing it, but with these cars, you should always have a spare BR in your glove compartment because they are notorious for going more often than probably any other part besides rebuilt alternators.
