Classic cars forum & vehicle restoration.
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22449 Location: UK
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Posted: Thu Aug 29, 2013 4:09 pm Post subject: Something awry with dynamo or control box... |
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I noticed the Volvo's ignition/ammeter light is staying on now permanently; a meter over the battery with the engine running shows 12v regardless of engine revs - I assume there's something up with the dynamo.
Other than brushes in the dynamo, is there anything else I should be looking at? Fan belt is ok AFAIK, other than furred up connections is there much in the control box or the wiring to it that can be fiddled with successfully, or does the meter reading confirm it's solely the dynamo at fault?
thanks, RJ _________________ Rick - Admin
Home:https://www.oldclassiccar.co.uk
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peter scott
Joined: 18 Dec 2007 Posts: 7119 Location: Edinburgh
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Posted: Thu Aug 29, 2013 6:10 pm Post subject: |
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Hi Rick,
If by shorting the F and D terminals together on your dynamo you still don't get a charge then brushes should be your next investigation.
If you do get a charge then the control box needs investigation.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Fri Aug 30, 2013 3:32 pm Post subject: |
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Hi Rick. This may contain some useful info.
http://freespace.virgin.net/tommy.sandham/dynamo.htm
Way-way back. I had a dynamo that went to zero output, and old guy told me to try "re-flashing" it to get the polarisation back and it worked, simple as that. |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22449 Location: UK
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Posted: Fri Aug 30, 2013 3:34 pm Post subject: |
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Curiously a wiggle of a slightly suspect connection on top of the dynamo, and a few sharp taps on its casing with the handle of a hammer (technical stuff this) and it came back to life.
I've not put a meter over it, but I did a few miles in the car earlier and it seemed ok. Either the dicky connection was causing the problem, or else a brush was sticking and freed off thanks to the gentle attentions of my hammer handle
RJ _________________ Rick - Admin
Home:https://www.oldclassiccar.co.uk
Videos:https://www.youtube.com/user/oldclassiccarRJ/videos
OCC & classic car merchandise (Austin, Ford ++):
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Peter_L
Joined: 10 Apr 2008 Posts: 2680 Location: New Brunswick. Canada.
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Posted: Fri Aug 30, 2013 3:42 pm Post subject: |
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Rick wrote: | Curiously a wiggle of a slightly suspect connection on top of the dynamo, and a few sharp taps on its casing with the handle of a hammer (technical stuff this) and it came back to life.
I've not put a meter over it, but I did a few miles in the car earlier and it seemed ok. Either the dicky connection was causing the problem, or else a brush was sticking and freed off thanks to the gentle attentions of my hammer handle
RJ |
Well we all know if the hammer trick don't work, use a bigger hammer.. |
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Jim.Walker
Joined: 27 Dec 2008 Posts: 1229 Location: Chesterfield
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Posted: Thu Sep 19, 2013 6:19 pm Post subject: |
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peterwpg wrote: | Hi Rick. This may contain some useful info.
http://freespace.virgin.net/tommy.sandham/dynamo.htm
Way-way back. I had a dynamo that went to zero output, and old guy told me to try "re-flashing" it to get the polarisation back and it worked, simple as that. |
That has been known to work with self-exciting dynamos (like Lucas), but I am not sure it is any good with (possibly) Bosch.
I do not know what makes are fitted to Volvos.
Jim. _________________ Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then! |
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