ducati regulator with bosch alternator?

[lazlokovacs]

my seperate regulator rectifier system on my lemans V are giving me trouble...

I have a late style ducati reg/rec from calvin,

can this plug and play with my 20amp bosch alternator?

cheers

[guzzisteve]

I don't think so, but I'm not a lectro physicist.  Check out the site in CO by the guys that know and make the stuff.

[Madtownguzzi]

You can start here https://www.euromotoelectrics.com/category-s/1846.htm

[jacksonracingcomau]

my seperate regulator rectifier system on my lemans V are giving me trouble...

I have a late style ducati reg/rec from calvin,

can this plug and play with my 20amp bosch alternator?

cheers

No
Bosch is excited rotor, needs controller to adjust voltage
Ducati is perm magnet — no wires for brush feed

For Bosch plug and play use specific bmw / guzzi  aftermarket one for plug and play,
Or adapt car bits or Honda dohc 750 one from 80’s ( need to insulate both brushes from earth / ground )

[Antietam Classic Cycle]

If you want to eliminate the separate voltage reg. and diode board/rect. of the Bosch system, why not use one of these?
https://www.euromotoelectrics.com/product-p/edl-voltrect.htm

[Wayne Orwig]

All of the Guzzi Bosch style alternators that I am familiar with (as in the Lemans) have a rotor that the regulator controls and separate diodes.
All of the Guzzi Ducati style alternators that I am familiar with (as in the CalVin) have a permanent magnet rotor and the regulator is part of the diodes.

So no, if you have standard systems. The regulator is significantly different.

[lazlokovacs]

thanks guys,

reading up on it now,

just out of interest, anyone know how the ducati regulator works????

[lazlokovacs]

If you want to eliminate the separate voltage reg. and diode board/rect. of the Bosch system, why not use one of these?
https://www.euromotoelectrics.com/product-p/edl-voltrect.htm

that would be eminently sensible,

I just found the neglected ducati one in a box and was wondering if it could be re-used rather than buying something new (snaps suspenders, saves the planet etc)

[Brian UK]

What year is your LM V? Just that most Guzzi around 1989 on had the Saprisa alternator.

If you know you have a Bosch one with brushes and slip rings on the rotor, fine, follow that advice above.
But if it is the Saprisa, then the Ducati box won't fit either,

[Kiwi_Roy]

thanks guys,
reading up on it now,
just out of interest, anyone know how the ducati regulator works????

Yes I do, the one on my VII Sport was faulty so I pulled it apart and reverse engineered the circuit. The weakness of this regulator was Guzzi's flakey wiring.
As Wayne and others say it's not compatible with the Bosh wound rotor. It's a series regulator, if the battery is low it turns on for half a cycle then checks again up to 1000 times a second. Unlike a shunt regulator it cannot stop charging in the middle of a cycle, it takes whatever the windings can throw at it.
The regulator set the Voltage between the black wire and the case to 13.9 Volts but the battery charges to about 14.5 on a good day.
Note: If anyone has one of these regs on an early 2000 era California or Spiney make sure you have a ground strap from the case to a nearby engine bolt as the small black wire Guzzi ran to the battery negative is not sufficient, it will undercharge. The regulator case must be solidly grounded to the chassis.
A couple of suggestions for the wound rotor Bosch.
https://www.euromotoelectrics.com/product-p/edl-voltrect.htm
https://www.electrosport.com/collections/street-motorcycles-moto-guzzi-1990-v1000-lemans-v This is one I have used, it came with enough wire to replace the loom wiring.

[Old Jock]

I have one of the Sachse Reg/Recs on mine combined with electronic ignition and it works well.

He used to produce just the reg/rec board and it was a lot cheaper, but not now, it's got signiificantly pricier.

Sachse is now producing a separate box Reg/Rec. I've never used it but all of their products I found reliable and work well, if you're in the US it probably won't be a goer but if you're in Europe it's a possibillty & you keep the Charge warn light

https://www.elektronik-sachse.de/shopsystem-3/en/regulator-reg4.html

Just a thought

John

[Wayne Orwig]

just out of interest, anyone know how the ducati regulator works????

The permanent magnet rotor system like on the CalVin is always 'ON'. So they use special rectifiers that can be controlled, to stop sending power to the battery.
The Bosch system uses plain 'always on' rectifiers, but controls the magnetic/rotor.
Each has good and bad points. The permanent magnet system appears to squeeze a bit more magnetic field in the small space. But the special rectifier for that system (thyristors) tend to run hotter. They both suffer from running at crankshaft speed at low RPM.

[1down5up]

If you want a modern Reg/Rec combo you need an "RR45" from Electrexworld - pretty sure (though not positive) that they are the manufacturers of these.
https://www.electrexworld.co.uk/cgi-bin/sh000001.pl?WD=guzzi&PN=RR45_-_Regulator_Rectifier_Moto_Guzzi_850_Le_Mans_850T_850T3_V35_V50111%2ehtml#SID=439


Note the one from Euromotoelectrics says that the charge light wont operate any longer - however I believe its the same unit and you hook the orange wire up to the charge light as per the RR45 instructions - https://www.euromotoelectrics.com/product-p/edl-voltrect.htm


I am just about to install one myself along with an m-unit and full re-wire

[Brian UK]

Each has good and bad points. The permanent magnet system appears to squeeze a bit more magnetic field in the small space. But the special rectifier for that system (thyristors) tend to run hotter. They both suffer from running at crankshaft speed at low RPM.

Permanent magnet rotors suffer badly if left for any time without a "keeper".  And loss of magnetism means loss of output and there is nothing you can do about it.