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Old 10-28-2014, 09:31 PM
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Default External voltage regulator on PCM controller voltage

I have a external voltage regulator id like to hook up on my 2014 chevy cruze. The alt is 140amp from what I can find and Is PCM controlled. I'd like to bypass that and use the external regulator but I don't quite know how to hook it up. Can any of you help me?


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Old 10-28-2014, 10:04 PM
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Why would you want to run a 130 amp alternator with an external regulator? Probably be best to upgrade to 250 300 amp alternator and have em build to external reg. And will probably end up having check engine light on.
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Old 10-29-2014, 11:24 AM
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Typically you can't do it unless you can replicate the PWM signal from the pcm bus, typically around ~100+ Hz.
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Old 10-29-2014, 04:06 PM
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If you have skills you can mod the brush holder/regulator assembly. Depending if its an a or b type regulator one brush will be ground or pos and other brush will be the field wire to the regulator.

Or find out if other regulators are available for the same family of alternator as you have. With non pcm controlled internal regulators there might be a few with different voltage set points to choose from.

what are you trying to accomplish? Don't believe all the hype about increasing your voltage. Your lucky to see 100 amps out of your stock alt at idle and if you're pulling more than 100amps then you will be seeing only battery voltage anyway. The only way it would help is if you had a bank or two of Maxwell caps.
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Old 10-29-2014, 04:26 PM
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^^^^^^^^^^this guy knows what he's talking about
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Sometimes I just want to drive my shit into a shop and hand them a fistful of money and be like... "Here. Do this shit."
I have zero problems with people having a shop or other enthusiast do their build. But it's a little disrespectful they take credit for it and/or don't correct people when they assume the owner did the work. Happens all the time.
4 zv4 18:2 ct7k: c pillar wall(not sealed off)156.11:
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Old 10-29-2014, 07:33 PM
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Quote:
Originally Posted by expo615 View Post
If you have skills you can mod the brush holder/regulator assembly. Depending if its an a or b type regulator one brush will be ground or pos and other brush will be the field wire to the regulator.



Or find out if other regulators are available for the same family of alternator as you have. With non pcm controlled internal regulators there might be a few with different voltage set points to choose from.



what are you trying to accomplish? Don't believe all the hype about increasing your voltage. Your lucky to see 100 amps out of your stock alt at idle and if you're pulling more than 100amps then you will be seeing only battery voltage anyway. The only way it would help is if you had a bank or two of Maxwell caps.

I'm trying to set a higher charging voltage. Not to mention if I do that it won't shut off half the time. That way I can demo full songs instead of the alt turning off after like a min.


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Old 10-30-2014, 12:11 AM
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Voltage is not your problem. Your alt can not supply enough current(amps). You are seeing voltage drop because you are pulling more current than the alt puts and running on just a battery. Your battery is not charging fully as well. Your alt is never turning off, it is prob damaged by now. Your pcm is setting the target voltage on the regulator. The target voltage varies it even has a battery temp sensor that lowers down the voltage as the battery gets hotter.
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Old 10-30-2014, 08:24 AM
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Quote:
Originally Posted by expo615 View Post
Voltage is not your problem. Your alt can not supply enough current(amps). You are seeing voltage drop because you are pulling more current than the alt puts and running on just a battery. Your battery is not charging fully as well. Your alt is never turning off, it is prob damaged by now. Your pcm is setting the target voltage on the regulator. The target voltage varies it even has a battery temp sensor that lowers down the voltage as the battery gets hotter.

It drops to 12v when I'm cruising with no sound system turned on. When I first fire it up it goes to like 14.5-6 and after a few minutes it drops to 12.5


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Old 10-30-2014, 08:35 AM
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You try manually Turing on your head lights?
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Sometimes I just want to drive my shit into a shop and hand them a fistful of money and be like... "Here. Do this shit."
I have zero problems with people having a shop or other enthusiast do their build. But it's a little disrespectful they take credit for it and/or don't correct people when they assume the owner did the work. Happens all the time.
4 zv4 18:2 ct7k: c pillar wall(not sealed off)156.11:
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Old 10-30-2014, 01:50 PM
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missing link audio piece worked for me!!

tricks alt to charging 14.5 constantly
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