1998 Mercury Mystique alternator

I checked all the connections and seem good. I pulled the new alternator back off and took it back to the parts store. They ran it through their tester and it tested good. They repeated the test and it still test good. I reinstalled it on the car. I put a volt meter on the battery and read 11.56 volts. I started the engine and retested the battery with the volt meter and still read 11.5 volts. According to the manual I have, I should read around 14.5 volts at the battery with the engine running and the alternator working. I am at a loss. What else can be going wrong?

I checked fuse #5 under the hood, it reads voltage on both sides. I also checked fuse #30 under the dash, it also reads good. I also checked the mega fuse by reading the voltage at the alternator end of the battery cable and read good voltage. Is there anything I can check?

Thanks for all your help. Every test led me back to a bad alternator even though the alternator past all the bench tests at the auto parts store. The store finally switched it out for another one and solved the problem.