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Old 10-30-2019, 08:31 AM   #1
Cartel
 
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Drives: 2007 Yaris Hatch is sold
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Location: Chilliwack, BC
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Exclamation 2007 Yaris Charge voltage too low, tried everything

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):



But I also see one with a bigger heat-sink on the regulator and a bigger body too:



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

My audio amplifier only uses 40 amps.

Thanks

Last edited by Cartel; 10-31-2019 at 06:18 PM.
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Old 10-30-2019, 11:07 AM   #2
Toolaholic
 
Drives: Olive yaris,FRS, Dakota R/T
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Location: Pa
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I had chestnut hill electric in Denver pa rebuild mine for $108. New bearing , voltage regulator and brushes.
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Old 10-30-2019, 01:00 PM   #3
Cartel
 
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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?
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Old 10-31-2019, 06:17 PM   #4
Cartel
 
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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?
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Old 11-03-2019, 08:04 AM   #5
06YarisRS
 
Drives: 06 2ZR Turbo Yaris RS
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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...cAAOSwI4xa4l9L
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2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer
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