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Thread: r/r questions: how to find out if r/r is series or shunt?

  1. #1
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    Default r/r questions: how to find out if r/r is series or shunt?

    Hi guys,

    I just bought my first bike (GS450L '83) and working on my license. Sadly that's going slower due to covid19.

    A little backstory:

    After testing the bike, which ran fine and rode nice as well, I bought it and my girlfriend rode it 90km homeward. According to her it was a really nice ride, smooth and comfortable.
    When we entered our street the bike suddenly died and the starter wouldn't turn anymore. The lights did turn on, but only faintly. We pushed it the last few 100 meters.
    Main suspect: battery wasn't charging, or it was dead. Turns out the battery is new and after charging it the bike starts without issues. Checking the voltage while running: it doesn't charge.

    I found another possible problem: the brake light would work, but the rear light wouldn't. Changing the bulb fixed that. This might be an electrical issue somewhere(r/r related? )
    So I'll have to go through the stator papers this weekend. My brother who's an electrician is also coming for some wrenching, should be fun.
    A replacement stator was sent to me by the seller, I think he felt bad for me. So I can go as far as replacing the stator on the check list.
    As for the r/r, that is a different question, they seem to be quite expensive here so I want to know what my options are.

    As a complete bike noob I've quite a bit of learning to do but I am eager to get this bike running and in tip top shape for spring.
    For the r/r I have a few questions after going through quite a few topics here and reading bikecliffs r/r compatibility list.


    1. How do I know if a r/r is series or shunt? In some topics here it was mentioned that any SHxxx unit is series and the FH-xxx units are shunt. Is this always the case?
    2. Is the list on bikecliffs site complete, and are no other units compatible?
    3. There are years listed for bikes (CBR1000RR 06-07). Are parts from bikes from other years not compatible even if the part number for the r/r (e.g. SH538) is the same?
    4. If the list is not complete, how do I find out if an r/r is compatible? (seems most r/r's are insanely expensive her compared to the US, think 3x as much).
    5. Is a SHINDENGEN SH532-12 compatible, which is not on the list(I found one for a "decent" price)?


    Thanks in advance.
    Any tips / critiques are always welcome.

  2. #2
    Nessism's Avatar
    Nessism is offline Forum LongTimer GSResource Superstar
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    Edit: sorry, just noticed you are from the Netherlands. Not sure what you have available in your home market. Polaris used a lot of SH775's so I usually search ebay for "polaris regulator" and then toggle "used" and sort by price. Then look for a SH775. Make sure the printing is visible. Be very careful purchasing new SH775's because there are a lot of fakes in the marketplace.
    Good luck in your search.

    Unless your bike has a SH775 or a compufire R/R you have a shunt jobby.

    Grab this fast before someone else does...https://www.ebay.com/itm/2011-Polari...temCondition=4

    Triumph PN T2500676 Harness matches nicely and sells for about $10. Order from your favorite source.
    Last edited by Nessism; 10-12-2020 at 10:39 AM.

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    Gorminrider is offline Forum Sage Past Site Supporter
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    1. Is a SHINDENGEN SH532-12 compatible, which is not on the list(I found one for a "decent" price)?
    Yes, if it IS a Shindegnen. There are many clones with the same number stamped on them. The common clue to clones is brand-new and really cheap. Cross your fingers with these.

    They are shunt-type.

    You will have to tinker a bit to mount it.

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    So the SH775, SH847 and the Compu-Fire 55402 r/r are the only series r/r's then?

    Quote Originally Posted by Nessism View Post
    Unless your bike has a SH775 or a compufire R/R you have a shunt jobby.
    Thanks. I searched for a compu-fire r/r and it seems I can only find new ones, no matter the location (us, eu, worldwide). Are these r/r's made new or are those just a bunch of fakes?
    As for the SH775, I found the cheapest one in EU at a whopping 195 dollarydoos.



    Quote Originally Posted by Nessism View Post
    Yes, if it IS a Shindegnen. There are many clones with the same number stamped on them. The common clue to clones is brand-new and really cheap. Cross your fingers with these.
    It was full of grime with the part number correct. It looked real. But that's my untrained eye. In the mean time I found a SH538 as well from a salvage shop.


    I'll wait for this weekend and see what's broken. Depending on that I'll probably get a shunt type if I can't get any decently priced series type.

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    Gorminrider is offline Forum Sage Past Site Supporter
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    It was full of grime with the part number correct. It looked real. But that's my untrained eye. In the mean time I found a SH538 as well from a salvage shop.
    Likely real then...just get some test or guarantee that a used one IS functioning and local sources are obviously best for this versus returning to ebay. That's the trouble with "used" of course- you just don't know their history.... but they've been a good bet in my experience.

    I've got various Shindegnen shunts on 5 motorcycles and they all work fine. I've never needed a new one. On the other hand, the original (NipponDenso?) on your bike have a very bad reputation. Don't replace yours with the original....I think there's just one person on the whole forum who still has the OEM R/R, but he was the original owner and that might go a long way to explain it.

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    Thanks! Good to hear that a shindengen shunt is still a major improvement over stock. I thought that any shunt type was terrible with all the hype for a series r/r.
    GS 450L '83


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    Gorminrider is offline Forum Sage Past Site Supporter
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    They still put shunt-type in new bikes. Series-type are popular on this forum but other forums don't mention charging as such a problem...

    When being thrifty, an old shunt from an old Honda or an old Series from an old Polaris snowmobile...might be a tossup.
    Main thing with R/Rs (IMO) is how hot they get. Keeping them in an airflow helps longevity. I guess the snowmobile MIGHT have had an advantage here, but Honda made a lot of reliable bikes....


    When buying new, you are in better country. Compufire, Shindegnen....
    Shindegnen makes both types
    Regulators/Rectifiers | Motorcycle Products | SHINDENGEN ELECTRIC MFG.CO.,LTD

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    The main advantage of a series R/R is because it protects the stator from return current over heat damage.

    I'm not sure about in some places of the world but in North America it's possible to find good used SH775's for $40 or so. I've collected a number of them over the years and tested them on my bike and I've never had one that didn't work properly. The only real issues I've seen are physical damage, in particular with the plastic connectors. Look at the locking tabs closely. Anyway, with a SH775 being as cheap as they are, it doesn't make much sense to get anything else.

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    Gorminrider is offline Forum Sage Past Site Supporter
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    it protects the stator from return current over heat damage
    Yes, that's a theory some believe. But even it being given there is "overheating", there might be other ways to control it...elaborate oil spraying has been done by a member. A heat sink on the casing itself too. Both of these would be more useful in the following example:

    If say, in the winter, running heated vest, grips, gloves, or other auxiliaries, the argument of "overheating by shunting" has less meaning, You "need" and "use" all the output. Very little will be "shunted".

    Oh- and then there's a question of the spike as the series opens and closes an inducted field......I expect the R/R will be designed to control it, but oscilliscope pictures I've seen worry me a little.
    Last edited by Gorminrider; 10-13-2020 at 01:55 PM.

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    It's a bit of drift, but "Series" regulation isn't a new thing. I fuzzily recall a mechanical relay was, in the old field-type generators. I don't think I ever saw one in an alternator. (That might beg the question: do they use solid-state shunting or series in the field regulation of alternators? i don't know)

    But it might be interesting to get home using a hefty relay to mimic series (or shunt! )in a pinch..I'd definitely want a large capacitance across the points though.

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