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Alternator/(generator?) not charging


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Thanks Docc. Yes, it's a PC545, approximately 5 years old according to the previous owner. I did in fact get a reading on the battery at idle: 13.28v (before I went for the ride).
I use the attached 7.5amp Duracell charger. It was recommended by an old-timer at Batteries+ who said he was very familiar with the PC545.37872f0c955d799e79df119ee2b6e932.jpg

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Cool! 7.5 amps should be adequate.  13.28v at idle looks fine, but should increase to 14.2v at even 2002-2500 rpm and stay stable as the rpm increases.

"Discharge before charging" for best results . . . monitor voltage while charging with any external charger: it should never exceed 15.0v or "float" below the 13.5-13.8v range. -> NEVER below 13.2v!

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Great - thank you for the info Docc. I wish I measured again at idle after the ride, I gotta believe it would have been higher than the 13.28. I'll definitely measure the voltage while it's on the charger and keep an eye on it.

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Oh, yeah, there is the thing about isolating the regulator from external charging (pull the 30 amp fuse while charging). Some say, "Yeah, whatever", but my regulator supplier says to isolate the regulator from external charging.

IMG_4356.jpg

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Forgot about that.
I'm going to send that screenshot to my contact at ElectroSport and see what he says - will report back.

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FWIW, my latest (#4) OEM type regulator invoice, January 2018, from Euro MotoElectrics, Denver, CO/USA, does not have this advice added.

My #2 regulator (first replacement in 2005) came from a Moto Guzzi dealer.

It was Regulator #3 (also from Euro MotoElectrics), July 2010, that had those advice labels added.

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Ok, here is the reply from ElectroSport regarding charging and an extra ground:

"You do not need to disconnect the reg/rect when charging.
I suppose an additional ground might be helpful, I cannot see how it could hurt in any way, so it is a good idea.  But I would not say it is required.  Every reg/rect could benefit from additional ground connections but in most cases it would make no difference."

Thank you,

Kyle Wood - Sales Manager

Procom Engineering / ElectroSport
21 Brookline, Aliso Viejo, CA 92656
PH: (949) 305-4200
www.electrosport.com



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Thanks, @4corsa !

The matter of disconnecting during charging has always been debatable, yet I figured it was worth following those instructions if it helped the regulator last any longer. Here again, though, I can just pull out the service switch on my added 30 amp circuit breaker. I would risk fatiguing the female terminals by pulling and replacing the fuse every time.

Certainly with regard to how we know the regulator is so very poorly grounded on the V11, we should all be able to agree that a dedicated ground is very well indicated, in our case.

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Disconnecting before charging a battery was also something I was raised with.

But that was so many years ago.

Aren't Zener diodes used to protect the regulator?

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  • 3 weeks later...

IMHO you must provide a decent ground cable to the regulator case, all the current that passes through the red wire to the battery has to find its way back from chassis to the regulator case, the tiny black wire all the way back to the battery doesn't cut it.

The Ducati Energia regulator doesn't directly control the battery Voltage, it regulates the Voltage between its black wire and case ground to 13.8 Volts so if the case is not connected to battery negative properly the Voltage you drop between negative and the case is lost. Probably when the bike was new it made fairly good contact to chassis but as it ages it has to rely more and more on the thin black wire. The path through the engine to the main ground connection to the battery is many times better than the black wire.

A short heavy wire from the regulator case to a timing cover bolt is a vast improvement.

I have even suggested using an aluminium strap in place of a wire with suitable grease to stop corrosion of course.

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...to add to Kiwi_Roy's post, the rep from ElectroSport who set up my regulator with the correct connectors tied off the small black ground wire so it is not used. He said to make sure the connection at the case to the bracket was clean and tight as that makes a better ground. That said, I'm going to attach a heavy gauge wire from under the regulator fastener washer to a timing case bolt as Kiwi_Roy recommends. A guaranteed ground for 10 minutes worth of work - why not?

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