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Kubota voltage regulator in Jab 2.2

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Kubota voltage regulator in Jab 2.2

Postby Arwel » Wed Nov 28, 2018 1:18 pm

Hi All
I have a Tecnam P92 fitted with a Jab 2.2. Recently I had to remove the engine due to sheared flywheel bolts. After re-fitting, i noticed that the battery was not being charged. I have replaced the regulator/rectifier with a compatible ebay part, still nothing. I am beginning to suspect that it has not been re-connected correctly. Can anybody please advise on how to connect it to the aircraft wiring?
I have 5 (aircraft side) wires in all, two which come from the altenator stator, 1 connected to the battery negative terminal and another two (which are actually connected together) which is the +ve and is connected to the fuses common + rail. The regulator has 6 spade terminals and is a Kubota RS51-55 type.

Thanks

Arwel
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Re: Kubota voltage regulator in Jab 2.2

Postby Admin » Wed Nov 28, 2018 1:59 pm

regulator pinout.jpg
regulator pinout.jpg (42.15 KiB) Viewed 405 times
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Re: Kubota voltage regulator in Jab 2.2

Postby Arwel » Wed Nov 28, 2018 3:54 pm

Perfect, I can see where I've gone wrong now, I had the alternator connections on the two left hand terminals, not sure if this has damaged the unit in any way.
What should the DC output be out of this unit, I'm guessing it should be about 14v?
Thanks
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Re: Kubota voltage regulator in Jab 2.2

Postby diablo » Thu Nov 29, 2018 8:24 am

Output is a function of RPM.

At around 2500 you should see between 14.4V and 14.6V
Sent from my "Electronic Numerical Integrator And Calculator" E-N-I-A-C
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Re: Kubota voltage regulator in Jab 2.2

Postby Arwel » Fri Nov 30, 2018 6:36 pm

Thanks very much for that, I have connected it as shown and everything is now ok, it must have been connected incorrectly after the refit.
Thanks for the info, saved a lot of heartache.
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Re: Kubota voltage regulator in Jab 2.2

Postby skyjeep » Sun Dec 02, 2018 7:51 am

Arwel, Glad you have the electrics sorted, do you mind saying what the condition of the flywheel bolts was, did it have the newer spider flange or Nordlock washers? I have an old model coming up for 500 hrs since last bolt replacement and want to get it sorted the best way, the service info says no loctite and with ordinary Nordlock washers, but I recall the UK guys who pioneered the use of Nordlocks actually did it with X-series (bellville) Nordlocks

Ralph in NZ
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