A simple series of tests for your rectifier

[spuggy]

Originally Posted by Luddite

I may be misreading your post, Spuggy, and, if that's the case, apologies, but are you saying the SH821 is a series type regulator?

I was under the impression that the SH821 was. But I was wrong; it diode-checks as a shunt.

Well, frolicking puppies and rainbows...

I knew the SH775 is a 35A SCR series R/R, and the SH847 a 50A version of the same. The SH821 is a later (& still current) type; to my mind, it beggars belief that Ducati are still fitting SCR shunts to new bikes...

Ho-hum. Found a cheap source for SH775's (heh - Polaris have jacked the price of their part to $200 since the Strom guys discovered them at 60).

Least the 775 will be a straight swap ...

Originally Posted by Luddite

knowing Ducati as we do, you wouldn't expect the bean counters to authorise a top spec R/R when a cheaper option is available.

Sigh. Until comparatively recently, I did not share your cynicism regarding Ducati's bean counters. I see now that this was naive of me...

Originally Posted by Luddite

I was under the impression it was an unremarkable SCR shunt type (I think the S in SH signifies SCR circuitry and the F in FH indicates (MOS)FET).

Yup, I believe that you are correct.

Having corresponded with Shindengen in the past, I pinged them an email for clarification and, to their credit, they replied straightaway:

FWIW, I'll say "sorry" to anyone I may have inadvertently misled...

[Luddite]

Negotiating your way through all the Shindengen R/Rs is a real minefield, Spuggy, especially as Shindengen themselves don't appear to publish a list of all their models and types, (at least I've never managed to find one).

It also doesn't help that, despite producing products with fundamentally different circuitry, Shindengen uses the same labelling system to identify them all - SH775, SH821, SH847 - you can't tell from the model no. which is shunt and which, if any, is series. It would be much simpler if the series type had its own dedicated suffix (they do identify the MOSFET type with an 'F' after all). But that would make life too easy, wouldn't it?!

[Darren69]

It could be draining through the reg/rec if the reg/rec is faulty. It's rare but it's always connected across the battery even when bike if 'Off'. Just some more food for thought.

Originally Posted by Darren69

It could be draining through the reg/rec if the reg/rec is faulty. It's rare but it's always connected across the battery even when bike if 'Off'. Just some more food for thought.

.....thanks Darren, will look out for that one too, sounds like I may be embarking on a voyage of discovery here !

[Darren69]

Originally Posted by Moco1961

.....thanks Darren, will look out for that one too, sounds like I may be embarking on a voyage of discovery here !

If you're chasing down a parasitic battery drain then Lud's diode tests should show that as a potential issue. you can disconnect the black plug from the reg/rec and there should be no drain on the battery or there will be if the diodes in the reg/rec are failing.

[adie851]

Thanks Vince, I thought it if the AGM was well discharged then it would be game over.
Cheers adie851