Voltage Regulator
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Member
GTS 250 & T Max
Joined: 04 Jan 2012
Posts: 7
Location: Perth Western Australia
Wed Jan 04, 2012 12:01 pm quote
Hi folks,

First post. I found the site while searching the above.
Re part number 58086R, voltage regulator. Seems that the failure of this part is fairly common. However my dealer wants $300 for it. Is there a cheaper alternative out there somewhere? After market maybe?
Any assistance is welcomed. Thanks.

Great forum, have spent a few hours reading many posts.
Ossessionato
Joined: 12 Nov 2006
Posts: 2969

Wed Jan 04, 2012 12:24 pm quote
mizzotch wrote:
I recently had my voltage regulator/rectifier (referred to as the RR from here on) fail on my 2007 GTS that had only 2500 miles on. Like many others have experienced, mine failed having an unregulated output of over 18 volts when revving the engine up. The clue that something was wrong was that the check engine light was coming on when accelerating and would go off when idle. In fact, mine failed EXACTLY as described by the first post in this thread, right down to the fact that it was the first ride after I got back from vacation: Check engine light - Answer...Voltage Regulator_Updated

This of course sent me on a quest to find a replacement. Keep in mind I'm in Hawaii and the Vespa dealer out here basically doesn't stock any replacement parts. I was anxious to get my GTS back in riding form and ordering the replacement from scooterwest or the like would have meant missing another weekend of riding and then some as the part would come the next week. I saw on one of the threads that the part was actually made by Ducati. Since there is a Ducati dealer here, I decided to persue finding a suitable replacement through that route. After doing a search on ebay for Ducati regulators, it became evident that there was a somewhat universal replacement RR that fit a whole slew of Ducati bikes which were the same 2007 vintage as my GTS. Among the bikes this replacement fit was the 2007 Ducati 999. I called the dealer and what do you know- they had a new RR in stock for about 160 bucks! (less than the Vespa part) After playing 20 questions with the parts guy while he looked at it, it sounded like it would work with no problems.

So, I went down and bought it. I installed it and the bottom line is that IT WORKS with no issues. The only thing out of the ordinary about using the Ducati part was that the yellow wires were shorter and had a different connector on them. I used marine grade butt connectors to splice the yellow stator leads. The battery wires/connector plugged into the stock harness no problem.

Here's the part number on the Ducati regulator: 54040191A (made in Japan)

It should be noted that this part number is the newer (revised) RR. Just like Vespa, Ducati experienced many many failures with the previous Italian made RR (so much so they had a recall). This new RR is actually MADE IN JAPAN (as stamped on the box). It's lighter and slightly smaller than the broken RR which came out of my GTS. Installation was a snap and may have actually been quicker than installing the Vespa part since I did not have to remove the floor pan to disconnect the yellow wires.

Here are some photos of the new Ducati regulator and comparison with the old one.





The new one is on the left:



The completed splice of the yellow stator wires (battery connector just plugged right in):



Further Discussion- After asking around, there are two variants of the Genuine Vespa part- one is Italian made and the other is Chinese made....funny enough, it seems the Chinese version is better (according to some mechanics) I thought it was interesting that Ducati's own RR was JAPANESE. We trust the Japanese more with electronics, don't we?

As it turns out, there is lots of discussion on motorcycle forums about RR failures. Apparently, a popular mod for many bikes is to change out the RR for a Shindengen FH012AA. If you search Ebay, you'll find there is a seller there who sells kits, complete with connectors, for about $110. After my repair, I think the Shindengen kit is a viable option (even in terms of space). I just didn't want to wait. The Shindengen kit is also MOSFET based as opposed to the stock SCR. I wonder if the Ducati Japanese replacement might be a MOSFET as well given the lighter, smaller package it came in.

Here's a collection of links which are relevant to RR replacement:
http://roadstercycle.com/Shindengen%20FH012AA%20Regulator%20upgrade%20kit.htm

http://www.easternbeaver.com/Main/Elec__Products/Connectors/R_R_Connectors/r_r_connectors.html

http://www.vstrom.info/Smf/index.php?topic=12507.0

http://www.apriliaforum.com/forums/showthread.php?t=202735

http://www.triumphrat.net/speed-triple-forum/104504-charging-system-diagnostics-rectifier-regulator-upgrade.html

http://www.electrosport.com/street-bikes/regulators-rectifiers/
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 18817
Location: welaka, florida
Thu Jan 05, 2012 7:05 am quote
Athens Scooter in the US has them for $156.75 but not sure what the shipping would be to Perth.

http://www.athensscooterco.com/eshopprod_cat_4797-48549-48353_product_598282.605_Plain_washer_x_rear_lugg.htm
Addicted
Vespa GTS300ie , Beverly 350 st ,triumph speedmaster
Joined: 28 May 2008
Posts: 922
Location: essex united kingdom
Thu Jan 05, 2012 12:02 pm quote
Do the 125/150/200cc piaggio's that have a different type voltage regulator suffer from failure
Is it just the one type fitted to 250cc and bigger scooters

Never had one go on any piaggio/gilera/vespa I have owned
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 18817
Location: welaka, florida
Thu Jan 05, 2012 12:07 pm quote
Mine went on my MP3 250 last year. I know when I was looking for one there seemed to be different VR for different sized bikes but some may be interchangeable.
Veni, Vidi, Posti
2007 Vespa LX 190, 2011 LXV150ie, 2010 4T Stella 150
Joined: 26 Oct 2008
Posts: 7892
Location: Annapolis, MD, USA
Thu Jan 05, 2012 1:38 pm quote
stickyfrog wrote:
Athens Scooter in the US has them for $156.75 but not sure what the shipping would be to Perth.

http://www.athensscooterco.com/eshopprod_cat_4797-48549-48353_product_598282.605_Plain_washer_x_rear_lugg.htm
Athens is selling Vespa parts again? Yay!

I thought they had stopped a couple of months ago (or they were just missing from their website for some reason).
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 18817
Location: welaka, florida
Thu Jan 05, 2012 1:44 pm quote
I think they are selling off inventory...best to call before ordering I think.
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