| [ Total Views: 756 | Total Replies: 11 | Thread Id: 54624 ] |
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 Rustbucket68
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| posted on July 24th, 2006 at 06:47 PM |
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Alternator problem
Could anyone help diagnose this problem. We have a 76 beetle and the charging light is not going out until above 3500 RPM's . It used to go out about
1000 RPM's. The multimeter reads 11.75v when the light is on and 12.95 when the light is off. Any ideas ?
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 barls
A.k.a.: Mr indestructible
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| posted on July 24th, 2006 at 06:50 PM |
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how are the bushes in the unit.
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Rustbucket68
Seriously Crusin Dubber
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| posted on July 24th, 2006 at 06:54 PM |
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It was rebuilt 6 months ago so they should be ok but havent checked yet.
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aussiebaja
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| posted on July 24th, 2006 at 07:23 PM |
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is the wiring right on the back of the alt,no half broken wires |
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 Bizarre
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| posted on July 24th, 2006 at 07:27 PM |
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Can we clear a couple of things
You say alternator problems and 1976 beetle.
A 1976 beetle "should" have an internal regulator alternator.
Brushes are on generators
If you have a internal reg beetle i think you will need to swap units as there isnt anything you can do.
Futue te ipsum!!!
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68AutoBug
A.k.a.: Lee Noonan
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| posted on July 24th, 2006 at 08:45 PM |
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Hi,
Internal or external Regulator Alternators both have brushes....
The external regulator is the weak part if You have one of those type of Alternators...
The internal Regulator Alternators have [usually] only two connections...
One heavy wire for the power to go to the Battery...
and the small lead to go to the bulb in the dash/speedometer....
The light bulb is needed to excite the alternator into producing electricity....
My Volt meter in My dash reads around 14 volts most of the time I'm driving....
under 13 volts means You have a problem....
The light bulb in the dash should go out as soon as You rev the engine or sooner...
It sounds like Your Alternator needs an overhaul at an auto electrician... get a quote first...
If its brushes or diodes , it shouldn't be expensive...
but if a field coil etc has burnt out it will cost more...
with the voltages You quoted, something isn't working correctly....
Its usually only brushes or diodes or the regulator that may give trouble.....
Best of Luck
Lee
http://community.webshots.com/user/vw68autobug
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Bizarre
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| posted on July 24th, 2006 at 09:24 PM |
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| Quote: | Originally
posted by 68AutoBug
Hi,Internal or external Regulator Alternators both have brushes....
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Really??
never seen any brushes on my alternators.
[ Edited on 24-7-2006 by Bizarre ]
Futue te ipsum!!!
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Bizarre
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| posted on July 24th, 2006 at 09:28 PM |
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Hmmmm............. gunna have to pull an alternator apart one day and have a good look.
"There are two bearings, one at each end, and two brushes which ride on "slip rings"; on the spinning part. There should be a brush-block on the
side or top which may be removable so you could see the state of the brushes (the old style generator brushes are replacable in the car, but I
haven't had a REAL close look at the alternator). Alternator brushes wear much slower that generator brushes, so it may just have a slow
deterioration of these. If they are worn, also check that the slip rings aren't too worn down into "valleys" where the brushes ride. If this
happens the alternator would definitely need to go to an overhaul place to have the rings machined or replaced so new brushes will ride properly."
Damn that Rob and dave is a good site :blush
Futue te ipsum!!!
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barls
A.k.a.: Mr indestructible
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| posted on July 24th, 2006 at 09:29 PM |
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how do you think they get the power out of the rotating machinery other than a slip ring
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Bizarre
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| posted on July 25th, 2006 at 08:05 AM |
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I thought it was just induced fields
Like how a motor can generate - no brushes there
Futue te ipsum!!!
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MickH
A.k.a.: Michael Hutchinson
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| posted on July 25th, 2006 at 08:24 AM |
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| Quote: | Originally
posted by Bizarre
| Quote: | Originally
posted by 68AutoBug
Hi,Internal or external Regulator Alternators both have brushes....
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Really??
never seen any brushes on my alternators.
[ Edited on 24-7-2006 by Bizarre ]
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Have another look....
tssnq.com.au
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blutopless2
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| posted on July 25th, 2006 at 08:27 AM |
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they are there.
see.... air and water do mix 
1974 1300
1997 MK3 Golf GL
2003 NB Cabrio
2012 Golf VI GTI
2014 Audi A4 Quattro |
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