I’m looking for technical help or recommendations on: car alternator
Hello dear Mazda users.
My model is Mazda MX5-1.8iSE RED, 2009.
Unfortunately, it has a shot voltage regulator. The alternator charges my 15.98V battery. At first I thought that the problem was because I left the light on in the trunk for quite a long time. I couldn’t fire. I charged the battery and checked it, unfortunately the meter shows me 15.80 - 15.98V.
I need to buy an alternator, rather I will opt for a new one. Here I have a problem with the selection, if anyone would like to say what the alternator recommends. I saw Lukas in Euro Car Parts, but I don’t know if he’s good.
I may be wrong ( again ) but I thought that by 2009 it was the MK3 NC.
Might be worth checking to see if any water has got into the fuse box at the bottom of the door pillar in the passenger footwell. If the scuttle grommets leak and the fuse box gets wet it can cause all sorts of odd problems.
The Charging System spec on the Mazda manual says 13 to 15v and the trouble shooting says if over 15v:
Monitor the ALTT V PID using the M-MDS or equivalent, or measure the voltage of PCM terminal 2AJ using a tester. Is the voltage between 13 and 15 V?
Yes
Go to Step 5.
No
PCM input error
This then give the problem as a PCM error of some description so probably the Alternator is shot?
I apologize to everyone for the situation with my post and giving me a hint where to look for the cause of the problem with my car.
As a new owner of Mazda, unfortunately, I will definitely make a mistake somewhere, but only from mistakes a man learns.
The car had a discharged battery, I was afraid to drive the car because I couldn’t start it. The battery was charged and prudently I went to check how the alternator is charging the battery and if everything is fine. The meter showed a strange reading.
At work in the morning I checked again if everything was ok. I was shocked by the situation. The meter showed charging by the battery above V17.80.
Today, before work, I went to buy a battery for my meter and replaced it. I checked the car again. Now everything is fine.
The battery meter showed V12.5
Turning the ignition switch value V12.3
Engine start voltage drops to V10.5
Charging under load and without V14.
Thank you all for your valuable comments and sorry for the confusion.