Can anyone recommend a rectifier that will fit in my early Magneti Marelli generator to replace the original shunt points (made up name).
I know the unit is similar to the Bosch unit fitted on early singles. Also has anyone any wiring diagrams or testing information for this unit as I’m not sure all of the wires are in the correct place I am not getting any charge.
Roy, what bike is it for?
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Hi Roy
You could try:
I’ve trawled through their website, couldn’t find anything but might be worth a call
Nik
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Or here maybe:
just click on the blue hyperlink.
Nik
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It’s for a 1937 Benelli 4TN /500
It has the Magneti Marelli generator that is made under licence from Bosch
Have you looked at the Paul Goff website, he lists a dynamo regulator and Bosch dynamo wiring diagram and a dynamo test
http://www.norbsa02.freeuk.com/goffyelectrex.htm
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I would assume a bike of that era would have a dynamo that produces DC, rather than an alternator which produces AC.
A dynamo just needs a regulator to limit the output whereas an alternator needs a rectifier to convert AC into DC and a regulator to limit the voltage.
This website has some info on the Benelli 4TN, but no wiring diagram
http://www.rpw.it/Documentazione.htm
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Hello Don, I purchased a V Reg dynamo regulator last weekend thinking this would solve my problem. (smug)
I have made a bracket that takes the place of the mechanical regulator and it fits perfectly. On reading the instructions it states that it needs to be wired as a Lucas dynamo, I’m bit confused at this point, so gave Alan Osborne a ring, big mistake I must have caught him on a bad day, he seemed angry that I owned an Italian bike and then reeled off a list of things I needed to do, faster than I could comprehend or make notes. So know I have a dynamo, wires everywhere, a list of words in shorthand and a nice new regulator, So as they say all the gear but no idea. Why can’t they print a series of diagrams that make sense, “this goes here, that goes there”
Any help will be much appreciated
I’m afraid my knowledge on Dynamos can be written on the back of a postage stamp!
I assume you are referring to Alan Osborne of AO Services. His website does have some info on installation
I would imagine he is selling the same regulator that Paul Goff sells, his website has some info about testing dynamos
http://www.norbsa02.freeuk.com/goffyelectrex.htm
I hope this helps. If you are still struggling, the VMCC has a forum that might have some more knowledgable folk.
https://forum.vmcc.net/
Edit I have just come across this website that has some infor about Dynamo wiring, it may help you work out how to wire up your regulator. They have afew dynamo sections in the drop down menus.
Thanks Don, and thank you Ed but I’m afraid you have to be a VMCC member to even look at their site, fairs fair. I purchased the regulator on Sunday from Paul Goff but the instructions supplied only cover connecting to a Lucas dynamo. The information sheets supplied by Alan Osborne, The Magneto guys and Paul Goff ( they all say it can be done) only give you advice that is understandable if you have a degree in electronics, I have four wires from the Magnetti field coil where the Lucas has two, the Lucas has FAD&E where the Magneti has 51 & 61.
If there was a wiring diagram anywhere I could picture what is going on and where things join up.
Take a look at the Google Guzzi singles group. There are many conversations around dynamos and regulators, often describing the four wires and terminals 51 and 61. I did find a very good conversation about a guy trying to do exactly the ame as you, but ended up fitting a replacement old style unit.
Go to https://groups.google.com/g/guzzi-singles and search for Dynamo regulator, it will bring up numerous relevant conversations.
Most people seem to end up retaining the old mechanical points system. You could start a new thread and see if someone can tell you how to wire up your new electronic unit.
https://groups.google.com/g/guzzi-singles/c/YR9S9efNiu0/m/adoe757yAwAJ
I did come across this diagram that may help
There’s a lot of dynamo info on this website …
Another possible source of help is this company
This thread has some useful notes regarding the connections to a solid state regulator
https://groups.google.com/g/guzzi-singles/c/YR9S9efNiu0/m/mhfUHfM2BAAJ