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USM Ty Ty
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Post subject: Bad voltage regulator symptoms?  Posted: Tue Apr 10, 2007 3:00 pm |
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| kickin' tires'n lightin fires |
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Joined: Sun Dec 03, 2006 9:26 pm
Posts: 977
Location: Gorham, ME
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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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'89 90q Rallycross car
'86 CGT G2 Rally car
'00 Jeep XJ SWEEP rig
'86 Honda Magna 2 wheeled kergigger
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gidrew
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Post subject: Posted: Tue Apr 10, 2007 3:34 pm |
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| mach 2 with my hair on fire |
Joined: Sun Jun 06, 2004 5:39 pm
Posts: 1021
Location: schenectady, NY
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lazy alternator. I've seen brand new bosch units do that out of the box
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Red 1988 90q "The Redhead": Daily driver: Brakes and suspension-done....20vt soon to come
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AudiSport4000
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Post subject: Posted: Tue Apr 10, 2007 8:17 pm |
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| I post, therefore I am |
Joined: Fri Jun 18, 2004 8:32 pm
Posts: 7027
Location: Fort Wayne, Indiana
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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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1988 90q
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PRA4WX
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Post subject: Posted: Tue Apr 10, 2007 8:39 pm |
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| I post, therefore I am |
Joined: Tue Jan 03, 2006 10:52 am
Posts: 4720
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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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With regard to soteriology, show me a man convinced of his volition, and i'll show you total depravity.
90 Corrado GTB2260VK "TDI RatRod"
91 CQ "The Pale Horse"
93 Eurovan
96 LX450 the "Yetti"
Lemond Tete with added lightness
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Schwinn urban assault bike
Centurion "Kris Cooper commemorative edition" Gearing is fixed, but its got more than one speed!
"All men are squids." -John Calvin
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Katman
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Post subject: Posted: Tue Apr 10, 2007 9:11 pm |
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| mach 2 with my hair on fire |
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Joined: Mon Aug 22, 2005 11:44 am
Posts: 1462
Location: Southern Ontario, Canada
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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..! 
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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(Plenty Many Audi Pictures: http://www.frankdekat.com/pics/audi/Audipics.html )
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AudiSport4000
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Post subject: Posted: Tue Apr 10, 2007 9:22 pm |
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| I post, therefore I am |
Joined: Fri Jun 18, 2004 8:32 pm
Posts: 7027
Location: Fort Wayne, Indiana
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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..! 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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1988 90q
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