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Old December 14th, 2018, 03:54   #2
oilhammer
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic
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Which engine is it ? There are three. The Ford derived 2.0L (Mazda calls it MZR, Ford calls it Duratec), the 2.5L version of that same Ford engine, or the Mazda Skyactiv 2.0L.

The charging system is likely the same for all of them, though. The ECU should control the charging output of the alternator. I would also want to make certain that the battery is the correct type and size for the car.

But it may just be a normal quirk of that particular car. There was a TSB for some about PCM reflashing, not sure if it applies to that car though.

Search for this:

TSB: 01-13-21
2012-2013 MAZDA3 - HEADLIGHTS FLICKER WHEN BRAKES ARE APPLIED
APPLICABLE MODEL(S)/VINS
2012-2013 Mazda3 vehicles (with SKYACTIV-G 2.0L and Halogen Type Headlights)

Chances are there have probably been a half dozen software updates for that car since it left the factory anyway.
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