We have an 02 dodge stratus changed the altenator and its charging but after it runs for a bit you hear what appears to be a relay pop and the light comes back on. I was wondering where should we start in finding the problem?

 

what we need from you before we can really help you...
Year (check), coupe or sedan, engine size, other electrical items that may not be factory (since it seems to be an electrical problem somewhere).

It's been said many times throughout this forum, that the 01-06 stratus can be two different cars (sedan = dodge, coupe = Mitsubishi), further complicated by several engine trims.

 

Ok, I forgot to ask a few further questions in my prior post. We still need that info BTW.
You hear what you think is a relay popping? where do you hear this sound coming from, as specifically as possible. and "the light comes back on" can you at least tell us WHAT light?