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Mazda 3 battery light on when heaters on

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Old Feb 3, 2021 | 04:40 PM
  #1  
Naseer96's Avatar
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From: Birmingham
Default Mazda 3 battery light on when heaters on

Hi
I got Mazda 3 bk 2009 I had issues with this car last month after battery change 2 weeks it was running fine the is start rough idle and cut off while driving mainly slowing down,

Battery light changed alternator and still was cutting off then a garage said is wrong battery so changed the battery again so far the car has not ran rough or cut off.

The problem i getting not that when the car got the heaters on full the battery light comes on soon as I switch the hetears off the battery goes off.

Battery and alternator is new
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thanks
 
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Old Feb 4, 2021 | 03:27 AM
  #2  
grim_reaper's Avatar
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From: Queensland Australia
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Alternator is controlled by the PCM.

Hook up a volt meter to the battery, what is the voltage at idle with the heater off vs the heater on?
 
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