Question about Ducati 900 SS Motorcycles

2 Answers

My 1984 Ducati 900S2 has a 3 wire alternator (YYR). Replacement Shindengan RR, 2 wire connection (YY) does not charge with headlight on.

Recently the regulator rectifier (RR) failed and was replaced by a Shindengan mosfet RR (I don't know the model). The new RR only allowed 2 wires from the alternator to be connected (YY). It does not charge enough to run with the headlight on. The (R) unconnected alternator wire shows 6V when the engine runs.

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  • Peter Scott Dec 07, 2016

    Thanks Gregg, unfortunately it's not that simple. This model was fitted with either 2 wire or 3 wire alternator (mine 3 wire). Does 3 wire mean 3 phase? Why are wires different colours in that case (YYR)? No new replacement parts available; the regulator rectifier you referred to is single phase? I am now looking for a connection diagram for a Shindengen FH548 to check the installation.

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Soudns like the wrong part.

Posted on Dec 09, 2016

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  • Ducati Master
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Hi, Peter you're trying to put a square peg in a round hole you need the correct regulator so all your electrics function properly for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Electrosport Industries ESR510 REGULTR RECTFR SNGL PHS DUCATI
http://www.regulatorrectifier.com/catalog/1977-1983-Ducati-900SD-Darmah-Regulator-Rectifier-85253
Ducati 900SS Workshop Manual
http://www.bevelheaven.com/manuals/900-S2_P.pdf
DUCATI Workshop Manual 900 MHR 900SS 1975 1976 1977 1978 1979 1980 1981 to...

Posted on Dec 06, 2016

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