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When you are not getting any charge power, measure the AC voltage. If it is low, maybe the rotor magnet is simply toast.Are the rotor and stator clean? Rust on them can weaken the output.Some regulators require the 12 volt input to activate the thyristors, are you supplying the 12V?
This link to another thread might be useful Canuckhttps://www.morini-riders-club.com/forum/viewtopic.php?p=17575Also NLM in the Uk (now Lusso veloce) might have the right bits or know what works https://www.lussoveloce.com/about. As you probably know they are/were the UK Moto Morini specialists.
Over the years (on single phase, permanent magnet rotors) I've taken to installing H-D voltage regulatorsThe units had a rubber plug with 2 leads that connect to the 2 output leads from the statorAnd a separate long lead to connect to the battery positive . It grounds through the body and hasNumerous cooling fins . Simple bullet proof available at any Harley dealer. AlsoDone it to many old brit bikes by simply reversing battery grounds also. Look into the years withthe 20 plus amp output and only 2 inputs from the alternator. Peter
i change the regulators on my morini's for shindengen mosfet regulators ( actually cheap chinese clones of the shindengen)On my morini's the regulators failed at some time , usually when i was riding in the dark So now i change them just for reliability sake.
AC charge power is over 50 V, rotor is very clean
The stator voltage is not an indication of the stator CURRENT. Although it usually means things are good, it doesn't always mean that they are.Measure the stator voltage while connected and it should be charging. If the stator AC is still close to 50V, then the regulator is not turning on for some reason. If the voltage is closed to say 15V AC, then it should be on and sending out current to the battery, but maybe there is not enough current.Another thing you can do is measure the stator current. If you don't have a large enough ammeter, it is easy to just put a piece of wire in as a shunt. As in, short out the stator with a one foot piece of 18 awg or so wire. Measure the AC voltage drop across that piece of wire. Look up the resistance for that piece of wire and you have the current.
With engine running, reg/rec connected, the voltage from the stator wires at 5000 ~ 6000 rpm is 60 V AC
Thank you for replying, your experience with Moto Morini is invaluable. I ordered one of these Spark Moto units, cheap (Guzzi content) hope it works! http://www.sparckmoto.com/Products/Detail/7I am going to look for a Harley Davidson two pin single phase reg/rec as well as per Peterís recommendations. Charlie recommends the same reg/rec unit you have used. I looked the type up online, a couple YouTube videos discussing them. Can you describe how to wire the unit? I read they are three phase but can function as single phase as well. My electric understanding is very, very basic, I just learned what a single and three phase is this week.
the single fase regulator/rectifier should work fine, looks like the ones i order from china. I try to use the mosfet ones ( F in the shindengen part number) because they do not heat up as much. just a warning : morini's run fine with a bad battery or even without a battery. , ( as you know the ignition is off a separate coil) but if you do the regulator has to burn the whole generator output, 130 watt , which causes it to overheat. having it buried somewhere behind a cover doesnt help.so you can start any morini without a battery in a emergency , but if you do so you should disconnect the generator.
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