This may very well be a $90 lesson in reading the manual first. Please read section
3.2 of the
FRC Control System manual so you do not destroy your replacement bridge.
However, do not be so hasty in assuming that all hope is lost. I have reverse biased the WGA600N adapter without destroying it. I have also pushed 24V into it without destroying it. However, I might have just been lucky, and I do not recommend doing either. I performed both of these tests using the regulated supplies on the PD, hooking it direct to your battery through a 20A breaker might have blown something - I really don't know, and I really don't have the extra bridges to find out.
In short, go read those sections, hook it up correctly, and see if it works.