In my experience with small engines (Briggs Stratton v twin) on Toro greens mowers, the voltage reading at stator wires is 28-30 VAC. AC does a sine wave thing, neutral and hot constantly changing back and forth. Your rectifier and diodes cut out the fluctuation and like magic you now have DC power. So DC volts in somewhere around 1/2 of the AC. Usually 12.8 - 14.2 VDC in my working with these systems. Steve M750 SS1000ds Concours 14 On Fri, May 31, 2019, 5:03 PM Ducdude via Ducati <ducati@list.ducati.net> wrote: > > > > ---------- Forwarded message ---------- > From: Ducdude <ducdude@verizon.net> > To: Ducati List <ducati@list.ducati.net> > Cc: Michael <masotomayor@comcast.net> > Bcc: > Date: Fri, 31 May 2019 17:03:14 -0400 > Subject: Re: No charge 97 748. > Thanks Mike, > > At the battery terminals with the battery attached I just get the the > dwindling battery Voltage sub 11Vdc. > > Any one know what kind of Vac I should get at the yellow wires coming > from > the stator ? > > Many Thanks, > Eric > > -----Original Message----- > From: Michael > Sent: Friday, May 31, 2019 16:37 > To: Ducdude > Subject: Re: No charge 97 748. > > I would suggest checking voltage while running at the battery terminals > Should read at least 11.5 -14v or so > > Sent from my iPhone > > > On May 31, 2019, at 3:58 PM, Ducdude <ducdude@verizon.net> wrote: > > > > Greetings all, my 1997 Ducati 748 decided to leave me stranded on the > way > > home today. Approximately a mile and a half before the ditching I > noticed > > that the red alternator light was on. Mile half later she sputtered and > > died. My emergency recovery vehicle a.k.a. my mother-in-law in my pick > up > > truck came to my rescue with the jump pack in with the application of > same > > the 748 roared to life. As long as the spare battery remained attached > to > > the bike the bike ran fine. Somethings I did notice though is that the > > charge light was not constant it was either on or off periodically. Once > > home I checked all the connections at the battery and cleaned them just > to > > be safe. Restarting the bike still prove that there was no charge > getting > > to the battery and the charge light is now on steady. The battery is a > > two-year-old Moto batt. Somethings I did notice though is that the > charge > > light was not constant it was either on or off periodically. Once home I > > checked all the connections at the battery and cleaned them just to be > > safe. Restarting the bike still proved that there was no charge getting > to > > the battery. The battery is a two-year-old Moto batt In good tune and > had > > a full charge when I left this morning. This bike has a tendency to eat > > regulator rectifier???s with fairly great abandon this would be the > fourth > > in 37,000 miles. I pulled the battery and put it on the charger and > > investigated all of the regulator wiring and connections and all seems > > intact there is no browning or blacking of the wires especially the > > yellow ones. Before I go ahead and put yet another regulator into this > > bike is there something else I could check to confirm that it is the > > regulator that is at fault? Many thanks in advance for your help I hope > > you all have a safe riding weekend. > > Best regards, Eric > > > > > > Sent from AOL Mobile Mail > > Get the new AOL app: mail.mobile.aol.com > > > > > > ---------- Forwarded message ---------- > From: Ducdude via Ducati <ducati@list.ducati.net> > To: Ducati List <ducati@list.ducati.net> > Cc: Ducdude <ducdude@verizon.net>, Michael <masotomayor@comcast.net> > Bcc: > Date: Fri, 31 May 2019 17:03:14 -0400 > Subject: Re: [Ducati] No charge 97 748. > > > > > To get the links and updates on all today's Ducati news: > http://www.ductalk.com/ > and > https://www.facebook.com/ducnet > _____________________ > Ducati mailing list > Ducati@list.ducati.net > http://list.ducati.net/mailman/listinfo/ducati_list.ducati.net > Mailto: scfoster1@gmail.com >

Seems many have chimed in on this age old problem that goes back to original writings by the Ducati Club of Victoria in Aus back in the 80s. Was a time when I was on first name basis with the GM of Electrex, who provided many RR for many MCs until bought out by Polaris? The good and bad, is my RC51 had same issue and my wife’s RVF400 also had same problem. Common theme? Poor location for cooling in V motors. Heard some put 5V PC cooling fans on RR to help with some luck. Should not be hard to do. Course somethings you might do to get better life is to make sure everything else is good, wires from alt to RR and connections as they run along block behind exhaust not so good for those wires. I sheathed them in insulating hi temp sleeve after upgrading those wires at alt stator. Up the gauge helps as well as getting best hi temp wire you can. Also upgrade batt wires which I did for many Duclist folks back in the day way before any brick and mortar business jumped in to that. I think at one point made a couple hundred wire sets but have not for a good 10 years now. Still have wire and tools though. Anyway, lots of better RRs these days, cooling is enemy for the shunted juice becomes heat. I wonder if any of the common cooling solutions for PCs would not help, all sorts of stick on cooling fins and fans available. If moving RR did not substantially add to wiring length certainly has to be better location for RR, in old days was up front under upper front cowl/fairing. So it got direct cooling air. New aero bodywork made that I guess not possible and thus started the problems back when the 851/888 etc. came out I suspect. Since a lot of stuff on these engines is 5V should not be too hard to find a 5V source to run a cooling fan. Some PC cooling fans are way easy to mount using nice wire clips and likely easy to duplicate the idea. Good thing about 5V PC cooling fans is lots of sizes and lots of airflow numbers available. As you may have guessed, besides owning Ducs for past 25 years and doing virtually all my own work, all the tower PCs I own for the past 20 years I built. Anyway good luck addressing problem been around as long as some current owners have been alive. I had first new RR in like 1995. Do not think my previous 900SS had the problem but where is RR on 900SS mounted? Hmmmmm. That to me is the issue and I have heard of no one really addressing that by moving the RR to a place with better cooling air. R Sent from Mail for Windows 10 From: scfoster1@gmail.com Sent: Saturday, June 1, 2019 9:53 AM To: Ducati Owners Group Subject: Re: [Ducati] No charge 97 748. In my experience with small engines (Briggs Stratton v twin) on Toro greens mowers, the voltage reading at stator wires is 28-30 VAC. AC does a sine wave thing, neutral and hot constantly changing back and forth. Your rectifier and diodes cut out the fluctuation and like magic you now have DC power. So DC volts in somewhere around 1/2 of the AC. Usually 12.8 - 14.2 VDC in my working with these systems. Steve M750 SS1000ds Concours 14 On Fri, May 31, 2019, 5:03 PM Ducdude via Ducati <ducati@list.ducati.net> wrote: > > > > ---------- Forwarded message ---------- > From: Ducdude <ducdude@verizon.net> > To: Ducati List <ducati@list.ducati.net> > Cc: Michael <masotomayor@comcast.net> > Bcc: > Date: Fri, 31 May 2019 17:03:14 -0400 > Subject: Re: No charge 97 748. > Thanks Mike, > > At the battery terminals with the battery attached I just get the the > dwindling battery Voltage sub 11Vdc. > > Any one know what kind of Vac I should get at the yellow wires coming > from > the stator ? > > Many Thanks, > Eric > > -----Original Message----- > From: Michael > Sent: Friday, May 31, 2019 16:37 > To: Ducdude > Subject: Re: No charge 97 748. > > I would suggest checking voltage while running at the battery terminals > Should read at least 11.5 -14v or so > > Sent from my iPhone > > > On May 31, 2019, at 3:58 PM, Ducdude <ducdude@verizon.net> wrote: > > > > Greetings all, my 1997 Ducati 748 decided to leave me stranded on the > way > > home today. Approximately a mile and a half before the ditching I > noticed > > that the red alternator light was on. Mile half later she sputtered and > > died. My emergency recovery vehicle a.k.a. my mother-in-law in my pick > up > > truck came to my rescue with the jump pack in with the application of > same > > the 748 roared to life. As long as the spare battery remained attached > to > > the bike the bike ran fine. Somethings I did notice though is that the > > charge light was not constant it was either on or off periodically. Once > > home I checked all the connections at the battery and cleaned them just > to > > be safe. Restarting the bike still prove that there was no charge > getting > > to the battery and the charge light is now on steady. The battery is a > > two-year-old Moto batt. Somethings I did notice though is that the > charge > > light was not constant it was either on or off periodically. Once home I > > checked all the connections at the battery and cleaned them just to be > > safe. Restarting the bike still proved that there was no charge getting > to > > the battery. The battery is a two-year-old Moto batt In good tune and > had > > a full charge when I left this morning. This bike has a tendency to eat > > regulator rectifier???s with fairly great abandon this would be the > fourth > > in 37,000 miles. I pulled the battery and put it on the charger and > > investigated all of the regulator wiring and connections and all seems > > intact there is no browning or blacking of the wires especially the > > yellow ones. Before I go ahead and put yet another regulator into this > > bike is there something else I could check to confirm that it is the > > regulator that is at fault? Many thanks in advance for your help I hope > > you all have a safe riding weekend. > > Best regards, Eric > > > > > > Sent from AOL Mobile Mail > > Get the new AOL app: mail.mobile.aol.com > > > > > > ---------- Forwarded message ---------- > From: Ducdude via Ducati <ducati@list.ducati.net> > To: Ducati List <ducati@list.ducati.net> > Cc: Ducdude <ducdude@verizon.net>, Michael <masotomayor@comcast.net> > Bcc: > Date: Fri, 31 May 2019 17:03:14 -0400 > Subject: Re: [Ducati] No charge 97 748. > > > > > To get the links and updates on all today's Ducati news: > http://www.ductalk.com/ > and > https://www.facebook.com/ducnet > _____________________ > Ducati mailing list > Ducati@list.ducati.net > http://list.ducati.net/mailman/listinfo/ducati_list.ducati.net > Mailto: scfoster1@gmail.com > To get the links and updates on all today's Ducati news: http://www.ductalk.com/ and https://www.facebook.com/ducnet _____________________ Ducati mailing list Ducati@list.ducati.net http://list.ducati.net/mailman/listinfo/ducati_list.ducati.net Mailto: rossaduc@gmail.com

My RR went out a mile from my house in a smokeing glory...It was so nerve wracking as I was on the ONE part of the road there was no place to pull over...but fortunatly it was down hill... The best part was the number of people that as they drove by asked if any assistance was needed...which I thought was pretty cool! I relocated the RR to the front under and just behind the triple and mounted on a block of Aluminum...no issues since ..but I also installed relays for the lights wired direct to the battery...I use the bikes wiring to energise the lamps...relay provides power.. Mike S > On June 1, 2019 at 10:12 AM Rich Roberts <rossaduc@gmail.com> wrote: > > > Seems many have chimed in on this age old problem that goes back to original writings by the Ducati Club of Victoria in Aus back in the 80s. Was a time when I was on first name basis with the GM of Electrex, who provided many RR for many MCs until bought out by Polaris? The good and bad, is my RC51 had same issue and my wife’s RVF400 also had same problem. Common theme? Poor location for cooling in V motors. Heard some put 5V PC cooling fans on RR to help with some luck. Should not be hard to do. Course somethings you might do to get better life is to make sure everything else is good, wires from alt to RR and connections as they run along block behind exhaust not so good for those wires. I sheathed them in insulating hi temp sleeve after upgrading those wires at alt stator. Up the gauge helps as well as getting best hi temp wire you can. Also upgrade batt wires which I did for many Duclist folks back in the day way before any brick and mortar business jumped in to that. I think at one point made a couple hundred wire sets but have not for a good 10 years now. Still have wire and tools though. Anyway, lots of better RRs these days, cooling is enemy for the shunted juice becomes heat. I wonder if any of the common cooling solutions for PCs would not help, all sorts of stick on cooling fins and fans available. If moving RR did not substantially add to wiring length certainly has to be better location for RR, in old days was up front under upper front cowl/fairing. So it got direct cooling air. New aero bodywork made that I guess not possible and thus started the problems back when the 851/888 etc. came out I suspect. Since a lot of stuff on these engines is 5V should not be too hard to find a 5V source to run a cooling fan. Some PC cooling fans are way easy to mount using nice wire clips and likely easy to duplicate the idea. Good thing about 5V PC cooling fans is lots of sizes and lots of airflow numbers available. As you may have guessed, besides owning Ducs for past 25 years and doing virtually all my own work, all the tower PCs I own for the past 20 years I built. Anyway good luck addressing problem been around as long as some current owners have been alive. I had first new RR in like 1995. Do not think my previous 900SS had the problem but where is RR on 900SS mounted? Hmmmmm. That to me is the issue and I have heard of no one really addressing that by moving the RR to a place with better cooling air. R > > > Sent from Mail for Windows 10 > > From: scfoster1@gmail.com > Sent: Saturday, June 1, 2019 9:53 AM > To: Ducati Owners Group > Subject: Re: [Ducati] No charge 97 748. > > In my experience with small engines (Briggs Stratton v twin) on Toro greens > mowers, the voltage reading at stator wires is 28-30 VAC. AC does a sine > wave thing, neutral and hot constantly changing back and forth. Your > rectifier and diodes cut out the fluctuation and like magic you now have DC > power. So DC volts in somewhere around 1/2 of the AC. Usually 12.8 - 14.2 > VDC in my working with these systems. > > Steve > M750 > SS1000ds > Concours 14 > > > On Fri, May 31, 2019, 5:03 PM Ducdude via Ducati <ducati@list.ducati.net> > wrote: > > > > > > > > > ---------- Forwarded message ---------- > > From: Ducdude <ducdude@verizon.net> > > To: Ducati List <ducati@list.ducati.net> > > Cc: Michael <masotomayor@comcast.net> > > Bcc: > > Date: Fri, 31 May 2019 17:03:14 -0400 > > Subject: Re: No charge 97 748. > > Thanks Mike, > > > > At the battery terminals with the battery attached I just get the the > > dwindling battery Voltage sub 11Vdc. > > > > Any one know what kind of Vac I should get at the yellow wires coming > > from > > the stator ? > > > > Many Thanks, > > Eric > > > > -----Original Message----- > > From: Michael > > Sent: Friday, May 31, 2019 16:37 > > To: Ducdude > > Subject: Re: No charge 97 748. > > > > I would suggest checking voltage while running at the battery terminals > > Should read at least 11.5 -14v or so > > > > Sent from my iPhone > > > > > On May 31, 2019, at 3:58 PM, Ducdude <ducdude@verizon.net> wrote: > > > > > > Greetings all, my 1997 Ducati 748 decided to leave me stranded on the > > way > > > home today. Approximately a mile and a half before the ditching I > > noticed > > > that the red alternator light was on. Mile half later she sputtered and > > > died. My emergency recovery vehicle a.k.a. my mother-in-law in my pick > > up > > > truck came to my rescue with the jump pack in with the application of > > same > > > the 748 roared to life. As long as the spare battery remained attached > > to > > > the bike the bike ran fine. Somethings I did notice though is that the > > > charge light was not constant it was either on or off periodically. Once > > > home I checked all the connections at the battery and cleaned them just > > to > > > be safe. Restarting the bike still prove that there was no charge > > getting > > > to the battery and the charge light is now on steady. The battery is a > > > two-year-old Moto batt. Somethings I did notice though is that the > > charge > > > light was not constant it was either on or off periodically. Once home I > > > checked all the connections at the battery and cleaned them just to be > > > safe. Restarting the bike still proved that there was no charge getting > > to > > > the battery. The battery is a two-year-old Moto batt In good tune and > > had > > > a full charge when I left this morning. This bike has a tendency to eat > > > regulator rectifier???s with fairly great abandon this would be the > > fourth > > > in 37,000 miles. I pulled the battery and put it on the charger and > > > investigated all of the regulator wiring and connections and all seems > > > intact there is no browning or blacking of the wires especially the > > > yellow ones. Before I go ahead and put yet another regulator into this > > > bike is there something else I could check to confirm that it is the > > > regulator that is at fault? Many thanks in advance for your help I hope > > > you all have a safe riding weekend. > > > Best regards, Eric > > > > > > > > > Sent from AOL Mobile Mail > > > Get the new AOL app: mail.mobile.aol.com > > > > > > > > > > > > ---------- Forwarded message ---------- > > From: Ducdude via Ducati <ducati@list.ducati.net> > > To: Ducati List <ducati@list.ducati.net> > > Cc: Ducdude <ducdude@verizon.net>, Michael <masotomayor@comcast.net> > > Bcc: > > Date: Fri, 31 May 2019 17:03:14 -0400 > > Subject: Re: [Ducati] No charge 97 748. > > > > > > > > > > To get the links and updates on all today's Ducati news: > > http://www.ductalk.com/ > > and > > https://www.facebook.com/ducnet > > _____________________ > > Ducati mailing list > > Ducati@list.ducati.net > > http://list.ducati.net/mailman/listinfo/ducati_list.ducati.net > > Mailto: scfoster1@gmail.com > > > > > > > To get the links and updates on all today's Ducati news: > http://www.ductalk.com/ > and > https://www.facebook.com/ducnet > _____________________ > Ducati mailing list > Ducati@list.ducati.net > http://list.ducati.net/mailman/listinfo/ducati_list.ducati.net > Mailto: rossaduc@gmail.com > > > > > > To get the links and updates on all today's Ducati news: > http://www.ductalk.com/ > and > https://www.facebook.com/ducnet > _____________________ > Ducati mailing list > Ducati@list.ducati.net > http://list.ducati.net/mailman/listinfo/ducati_list.ducati.net > Mailto: masotomayor@comcast.net