What alternator for 2007 Yaris?

[Cartel]

My alternator has been giving me trouble and has a low charge voltage.
I took it apart and cleaned the regulator, checked the brushes and cleaned up the commutator and it all looks good (60,000KM).

The problem is it only charges at 13.6v-13.8v with nothing on while another identical car charges at 14.2v-14.4v.
I checked for voltage drop at full load (130mv) positive and negative (0.001mv) and AC (0mv)
I think my audio amp may have hurt it somehow. (guessing)

I am looking for a heavy duty alternator if possible or I guess I'm going to replace the regulator and see if that helps.
Could the ECM be damaged somehow?

I can find my alternator (27060-21150):
https://i.imgur.com/FROUEpy.jpg
https://i.imgur.com/qTZXCbC.jpg

But I also see one with a bigger heat-sink on the regulator and a bigger body too:
https://i.imgur.com/Umqjw6L.jpg
https://i.imgur.com/xstJWhy.jpg

Is there a better version?
These both say 80 amps but 1 looks much beefier.

My audio amplifier only uses 40 amps.

Thanks

[Toolaholic]

I had chestnut hill electric in Denver pa rebuild mine for $108. New bearing , voltage regulator and brushes.

[Cartel]

I took mine to the shop and they tested it, it 80+ amps at 13.5 they said no problem.
Its just that the ECM is throttling the voltage back or something.
Maybe someones run into this before?

[Cartel]

I notice the idle doesn't go up when I put the heater fan on.
Maybe the sense chip in the regulator is dead?
The A/C amplifier toast?

Anyone seen this issue?

[06YarisRS]

The internal voltage regulator is a common failure point as the contacts corrode due to water ingress. One of my Yari runs at ~ 13.8 - 13.9 and the other ~14.2 - 14.4. Both have passed voltage drop tests and neither have any driveability or starting problems. I too looked at an upgraded alternator as I was adding some additional electronics (stereo with amp 75w x 4 and NVX 8" powered sub etc), but the stock 80 amp alternator has proved more than capable of handling the power demands. I think the upgraded alternator I was looking at was 120A. Since your alternator tested good and you don't have a flickering or steady battery light on in the instrument cluster, you're probably fine. Then again, if you drive your amp hard, an upgrade might be a good option.

Here is an upgraded 145 amp alternator for 06 - 14:

https://www.ebay.com/itm/High-Output-145-Amp-NEW-Heavy-Duty-Alternator-Fits-Toyota-Yaris-2006-2014-1-5L/202562767956?hash=item2f29ae8c54:g:mrcAAOSwI4xa4l9 L