Regulator - Smoking - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 20 (permalink) Old Jun 16th, 2019, 9:06 pm Thread Starter
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Regulator - Smoking

My 1994 ss/sp ducati has been snoozing for 22 years. I have been working on it, repairing one thing after another. Brakes, belts, gas tank, carbs, clutch hose. etc etc.

It is not registered to ride yet, I am waiting to get ride worthy, so I usually sneak a ride around the block for a test. Yesterday I came back and smelled smoke and saw a little smoke coming from the front of the motorcycle. I have read a few posts by others that the electricals up front connected to the regulator are not so good. So I took it apart and checked the wires and regulator with the volt meter on the diode setting. It tested good. I connected the regulator back up and grounded it, and started the motorcycle again. The potting in the back of the regulator was melting. I can assume it is fried, but it still test good. It doesn't Make sense. Any one have more experience and can shed some light.

Thanks

Steve

2005 Harley Davidson Road King, 1993 KTM 525 EXC
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post #2 of 20 (permalink) Old Jun 16th, 2019, 9:28 pm
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Are you sure you did the diode checks correctly? The symptoms and my experience sure point to a shorted diode in the rectifier bridge. Here's a handy guide attached.
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post #3 of 20 (permalink) Old Jun 16th, 2019, 10:06 pm
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if goo is melting out the back it's rooted.
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know all wanker
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post #4 of 20 (permalink) Old Jun 17th, 2019, 2:13 am
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Smoking but still operating = it's in it's death throws.

Repair or replace ASAP, and I wouldn't run it anymore until that issue is addressed.


Never Quit, Die Falling Forward
1996 900 CR. ... LOW ZOOT
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post #5 of 20 (permalink) Old Jun 17th, 2019, 7:34 am
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Quote:
Originally Posted by belter View Post
if goo is melting out the back it's rooted.
Translating one more time for our non-Australian friends.

Rooted is an Oz equivalent for fucked and some other more polite terms for it is not in all likelihood functional.

Richard Collins - 2001 900SSie I have a 2 strike policy - 2 no responses from a poster = no more responses from me to any post by them. I have a good memory!
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post #6 of 20 (permalink) Old Jun 17th, 2019, 7:54 am
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Quote:
Originally Posted by Rex Coil 7 View Post
Smoking but still operating = it's in it's death throws.

Repair or replace ASAP, and I wouldn't run it anymore until that issue is addressed.

I'd submit this is precisely the scenario that could, in addition, create further damage and take out the stator as well.

OP pull that RR...remove it immediately without hesitation or attempting further onboard diagnostics. You are tempting fate doing so.
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post #7 of 20 (permalink) Old Jun 17th, 2019, 8:13 am
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And replace it with a MosFet or a Series R/R not another shunt type. I've seen pix of bikes on fire from a shorted R/R so fix it immediately. No connection but from experience Jack at Roadster is a good guy with a great product.

https://roadstercycle.com/
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post #8 of 20 (permalink) Old Jun 17th, 2019, 8:47 am
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Originally Posted by StraDuc View Post
And replace it with a MosFet or a Series R/R not another shunt type. I've seen pix of bikes on fire from a shorted R/R so fix it immediately. No connection but from experience Jack at Roadster is a good guy with a great product.

https://roadstercycle.com/
I checked that website .... good stuff Maynard!

I learn at least two new things every day in this forum.


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post #9 of 20 (permalink) Old Jun 17th, 2019, 8:51 am
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Once you let the Italian smoke out you cant get it back in--Stick a fork in it mate it's done --Call Ricks

1991 Ducati 900ss, 1991 Ducati 907ie. 1978 Yamaha SR500, 1979 Yamaha RD400 Daytona Special, 1973 Truimph X-75, 1975 Triumph T-160, 1976 Triumph T140, BMW's too many to list
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post #10 of 20 (permalink) Old Jun 17th, 2019, 9:59 am
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If so inclined, increase the wire size from the tiny OEM 16 gauge to 12...the whole run from stator to RR.....eliminating any mid connector.

To be clear, the Shindengen RR is not directly "hardwired", it is using weatherproof Furukawa connectors...so it is able to be unplugged for diagnostics or removal.

Long before Roadstercycle became a popular source, I bought a couple of ebay $50 FH010 from salvage ZX10 Kawasaki.....self installed in 2009 on both my 900SS and VFR800.

10 years on, they both remain in service, reliable and cool running to this very day.

If going the salvage "pre-owned', self install route...avoid the Ebay Shindengen far east copies....choose genuine Shindengen Mosfet ONLY.
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'95 900SS/SP , '07 SS800 . '98 VFR800

Last edited by bigbadbass2; Jun 17th, 2019 at 10:06 am.
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