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Got battery tested yesterday and everything tested find with that too. I think I'm going to have to trace wires in the engine harness and see if I can figure anything out...

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...