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Bad voltage regulator symptoms?

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 Post subject: Bad voltage regulator symptoms?
PostPosted: Tue Apr 10, 2007 3:00 pm 
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So, when the engine first fires up, the alternator isn't charging. It has to be reved up to about 2000rpm, and then the alternator will start charging, and continue charging at idle. Bad voltage regulator?

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PostPosted: Tue Apr 10, 2007 3:02 pm 
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Possibly...My lights would also dim and get bright in a cycle...

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PostPosted: Tue Apr 10, 2007 3:34 pm 
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lazy alternator. I've seen brand new bosch units do that out of the box

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PostPosted: Tue Apr 10, 2007 7:55 pm 
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My bad voltage regulator overcharged and boiled the battery in my Audi Fox. If you ever need to get the clear coat off your paint, battery acid works great. :curses:

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PostPosted: Tue Apr 10, 2007 8:17 pm 
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Ever since my turbo swap Ive had to rev the car to around 2500-3000rpm to get the lights a tad brighter. I had to replace the VR and I still have this issue.

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PostPosted: Tue Apr 10, 2007 8:39 pm 
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My reman often at first start doesn't show a charge, once i click over 1k rpm or so she wakes up and shows a charge....has done this since i put it on.

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PostPosted: Tue Apr 10, 2007 9:11 pm 
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Quote:
It has to be reved up to about 2000rpm, and then the alternator will start charging, and continue charging at idle.


I've had that problem for quite a while on my 4kq. Somewhat related, the charging light doesn't EVER come on either.

In my case it's not the regulator. The whole thing died just the other day. I was sure it had something to do with the blue wire (as the charge light didn't come on), but apparently not. A new regulator fixed the 'no charge' problem, but not the 'Rev to 3000' to get it to start charging issue. But not to say the regulator isn't causing YOUR problem though..! :D

I think what's happening in my case is that the regulator isn't getting any power from the blue wire, and doesn't have enough juice to get charging until that first 'rev' creates enough power (from residual magnetism on the spinning armature) to power the regulator. Once the regulator gets started up, it's ok from then on..

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PostPosted: Tue Apr 10, 2007 9:22 pm 
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Katman wrote:
Quote:
It has to be reved up to about 2000rpm, and then the alternator will start charging, and continue charging at idle.


I've had that problem for quite a while on my 4kq. Somewhat related, the charging light doesn't EVER come on either.

In my case it's not the regulator. The whole thing died just the other day. I was sure it had something to do with the blue wire (as the charge light didn't come on), but apparently not. A new regulator fixed the 'no charge' problem, but not the 'Rev to 3000' to get it to start charging issue. But not to say the regulator isn't causing YOUR problem though..! :D

I think what's happening in my case is that the regulator isn't getting any power from the blue wire, and doesn't have enough juice to get charging until that first 'rev' creates enough power (from residual magnetism on the spinning armature) to power the regulator. Once the regulator gets started up, it's ok from then on..


Also, ever since the turbo swap the ONLY dash "idiot" light that comes on is the check engine light (wired for the fault code stuff). The low coolant light will come on if the coolant is low, of course, as well. No other lights come on. I think the alt and oil light used to come on with the ignition. Wonder why my alt light doesnt work? I had planned on taking that blue wire off and cleaning both sides of it, maybe there is a contact issue?

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