[c-nsp] Redistribute default route

[Kern, Tom]

Hi all, i have 2 networks each with their own isp/internet connection. The networks are connected to each other via a T1 and each network's router has a default static route pointing to its respective isp router. 
the routers use eigrp to exchange info.
Now, im trying to implement some redudancy here so that if network A's internal router goes down, then users can still get to the internet via network B's connection(i don't care about incoming connections right now).
I've tried to redistribute the default route of each router into eigrp but this doesn't seem to take. The addresses never get into the other router's table at all(and vice versa). 
i'd like to ideally redistribute the gateway of last resort of each network into eigrp so if one router's isp int goes down, it will be rerouted to the other router's isp.

what am i doing wrong here?
thanks