no electrical power

Hi
I recently installed a new battery and alternator on my wifes 95 monte carlo 3.4 engine. It ran great until the next day when I went to start it where it seemed like the battery was dead. Except it wasn't it has an open circuit somewhere. Is there a circuit breaker taht might have tripped? Thank you in advance to who ever might help me.
Bob

Are you getting any power to anything (lights, door dinger, etc.) or is the whole car completely dead?

the car is completely dead no lights or starting.

The battery should have one heavy cable going straight to the starter, then there should be some other smaller wires that make the rest of the car work, follow all of these small wires and make sure that they are all plugged into what they should be plugged into and that all of your fuses are good and not blown.

Also make sure that your ground cable is not loose on either end.