charging system

(2007 Mazdaspeed 3) I recently threw a belt after I had just replaced it. I don’t know what caused what but the alternator was stiff afterwards. I ordered a reman from a local parts store. (I’m not spending 500 on a new one). The old alternator was charging fine before all of this happened. (The...

Alright, 2007 Mazdaspeed 3. Have battery light on. Tested it myself, 12.8 v before car was on and around 11v when car was running without load. Took it to oreilly and tested while car was running, and said battery is good (but voltage was low (10.4v w/load)) and also said alternator was not...