Norm - You're probably right, if the issue re-occurs, I'll just keep an eye on it. In it's current spot, the regulator is on a piece of quarter inch aluminum plate & mounted under the bottom triple, out in the wind between the forks.
BRAD
What was it, I wondered, that so mystified and eluded British engineers when it came to the design of gaskets, seals and mated surfaces? They never did get the idea, right up to the end, that fluids belong on the inside of the engine, while fresh air and sunshine belong on the outside... - Peter Egan
From: The Ear Plug Guy <normmatzen@yahoo.com>
To: st2_owners@yahoogroups.com
Sent: Sunday, June 5, 2011 3:07 PM
Subject: [DucatiST] Re: Yet another Voltage/Regulator Question
If the normal charge voltage of ~14 V suddenly drops to 12.4V or so, the regulator has stopped charging the battery.
The fact that slowing the engine to below 1000 rpm (below the speed where the alternator output exceeds the battery voltage), then speeding it up again and normal operation resumes makes me think the regulator is over heating and the built in safety mechanisms shut it down for a while and by dropping the input voltage "resets" this protective feature.
Have you allowed the situation to remain in the mode where the battery voltage drops to 12.4 V and see how long it will stay there? I wouldn't be surprised if it doesn't "reset" itself after a short while? If you didn't have the wired in volt meter, you wouldn't know this was happening and would still be a happy camper!
I would try this to see if it will reset itself without dropping engine rpms after a short cool off period. By the way, is the regulator fastened to a stout piece of metal for a heat sink as well as being in the air stream for cooling?
Norm "The Earplug Guy"
--- In st2_owners@yahoogroups.com, Brad DeVries <triangleforge@...> wrote:
>
> I started seeing some very odd behavior yesterday from the onboard volt meter I installed along with the Honda R/R that I put in my 1998 ST2 about eight or nine months ago. While I'm more than happy to blame the regulator, it's got some quirks that make me wonder what's actually going on. Here's the scenario:
>
> After about five or ten minutes of riding -- with the voltmeter on the dash showing a happy 13.8 to 14.2 volts over 2,500 RPM -- the voltage will suddenly drop to 12.4 or lower at any RPM with one very weird exception: I can often get the Reg to "reset" (for want of a better term) by dropping the RPMs to idle at around 1,000 and re-accelerating, and it will run happily once again for a while, sometimes quite a while. Although it's a Honda part, I have it spliced into the Ducati wiring, including the infamous connectors (I had planned to cut them out, but it was working fine and other things were more pressing) so I opened all those up, cleaned everything and re-connected without solving the issue. When the problem finally occurred when I was near home, I tested the on-board voltmeter against the reading from my multimeter and it looks to be fairly on target.
>
> Before I suck it up and buy yet another regulator, is there anything else I should check? And why on earth should I be getting that "reset" effect?
>
> Thanks,
> BRAD
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> The road goes on forever, and the party never ends. - Robert Earl Keen, Jr.
>
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