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  #1  
Old 12-31-2016, 07:44 AM
Fast Eddie B Fast Eddie B is offline
 
Join Date: Dec 2016
Location: Mineral Bluff, GA
Posts: 43
Default Voltage Regulator - Ducati to John Deere (non-RV)

Hi guys!

I'm the owner of a 2007 Sky Arrow E-LSA with a ROTAX 912ULS.



My wife and I live in Mineral Bluff, GA and the plane is based at Copperhill, TN (1A3).

I was led to this site when I Google searched for info on the wiring to a Ducati voltage regulator.

After 10 years and about 450 hours, I'm on my third Ducati, though I'm not 100% sure the first two were bad. Often, the problem of the GEN light staying on could be traced to a bad or burned connection on the multi-pin connector.

Most recently:



A Google image search turned up at least one similar image in this forum.

Cleaning up the connection got things working again, but I'm considering the switch to the John Deere voltage regulator. I would like to ditch the multi-pin connector and just go with individual spade connectors for simplicity.

My main question concerns the 6 conductors on the Ducati vs the 5 on the John Deere.

Ducati:



My understanding is...

1) The case serves as the ground.

2) "Giallo" = yellow, and is the unregulated output of the generator

3) "Lamp" is for my GEN light

4) "Chiave" = key, so probably switched voltage from my Master switch.

My question concerns the "Rosso" = red and the "Batt", and where they would hook to the John Deere:



I think its clear the "Giallo's" go to "AC", "Lamp" goes to "Indicator Light" and the "Chiave" goes to "Ignition Switch". So where do the "Rossi" and "Batt" go? Might they both go to the "B+"? My AMM is no help.

I apologize if this has been covered, maybe repeatedly, but I really want to be sure not to blow anything up if I decide to make the change.

As an aside, has anyone come up with a setup to test the Ducati's?

Thanks in advance and I hope I can contribute in the future.

Last edited by Fast Eddie B : 12-31-2016 at 07:48 AM.
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  #2  
Old 12-31-2016, 08:27 AM
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DaleB DaleB is offline
 
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I can't speak for how your plane is wired, but in the RV-12 the R and B terminals are both connected to the battery positive terminal. I don't know if that's the case in all installations or not; the RV-12 is the only one I've seen that uses the Rotax and the Ducati regulator.

I'm sure there is a wiring diagram for your Sky Arrow somewhere, that would tell you for sure. Also... burnt terminals like the ones in your picture are usually the result of loose connectors. You may want to gently crimp the female connectors, or replace them if they're too far gone. They need to be be tight on the spade lug.
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  #3  
Old 12-31-2016, 09:29 AM
Mich48041 Mich48041 is offline
 
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There has been lots of discussion on the VansAirforce RV-12 forum about the John Deere Rectifier/Regulator. A search came up with THESE results.
The R and B terminals are connected together inside of the Ducati case. Therefore, splice the aircraft R and B wires together and connect them to the John Deere B+ terminal. All of your assumptions about wire connections are correct.
TESTING The Ducati regulator.
The John Deere "Ignition Switch" terminal must be connected to a switch and NOT directly to the main power bus or to the battery contactor or to the B+ terminal. If not switched, the pilot will not be able to shut off the alternator in the event of smoke in the cockpit, even if the aircraft battery is disconnected.
Individual spade connectors are a good idea because the connections can be tested individually for tightness. If the connections are not tight, they will get hot and cause damage.
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Last edited by Mich48041 : 12-31-2016 at 09:36 AM.
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Old 12-31-2016, 09:54 AM
Mich48041 Mich48041 is offline
 
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Mount the rectifier/regulator with heat conductive paste and keep it cool with moving air.
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  #5  
Old 12-31-2016, 09:40 PM
Fast Eddie B Fast Eddie B is offline
 
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Thank you, thank you, thank you!

My main question was answered with that cutaway, showing the "Rossi" and "Batt" connected inside the Ducati case.

As delivered, the Ducati voltage regulator was deep in a tunnel with no airflow and nearly impossible to access. As soon as my plane was Experimental, I relocated it higher, in the airstream and much easier to reach:



My engine is mounted "backwards", so the air flow is right to left in the above image. It's mounted on rubber-lined adel clamps, but I ran grounding wires from both ends to engine grounds. They're the two paired wired shown towards the left. I don't recall the gauge, but all 4 added together add up to a fair amount, though I'm considering going to a braided motorcycle ground cable when I do the swap, and will use conductive paste where it meets the regulator. Would the white heat-conducting paste used on the plugs be appropriate?

Finally, I found two similar looking "John Deere" regulators on Amazon.

One for $32.99 https://www.amazon.com/Rectifier-Reg...tage+regulator

One for $23.10 https://www.amazon.com/DB-Electrical...tage+regulator

Is there anything that would favor one over the other, or is there another source I should consider?

Thanks again.
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  #6  
Old 01-01-2017, 07:54 AM
Mich48041 Mich48041 is offline
 
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Quote:
Would the white heat-conducting paste used on the plugs be appropriate?
Yes, perfect.
Quote:
Is there anything that would favor one over the other
Yes, the price. LOL At that price, you could even carry a spare.
They are probably all made in China, even the ones sold by John Deere dealers. In fact, a RV-12 owner purchased one from a John Deere dealer and said that it looked exactly like the one he had previously purchased from the internet.
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  #7  
Old 01-01-2017, 09:28 AM
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DaleB DaleB is offline
 
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Quote:
Originally Posted by MMiller View Post
The Faston Rotax uses looks like a TE Connect PN 42281-2. The TE Connect data sheet does not "limit" the design current through the part, but does "recommend" not exceeding 15 amps continuous use on this part.
Perhaps that explains why there are two parallel connection points for the DC output of the Ducati regulator.
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  #8  
Old 01-05-2017, 03:11 PM
Fast Eddie B Fast Eddie B is offline
 
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Thanks for all the input and advice.

I just ordered the John Deere from Amazon. When I get around to installing it I'll update this thread with a pirep.
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  #9  
Old 01-14-2017, 06:44 PM
Fast Eddie B Fast Eddie B is offline
 
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After our EAA meeting today a friend was ready to help me with the conversion. It helps that he came highly recommended as very detail-oriented and professional.

Some issues were readily apparent. First, some of the crimps left a lot to be desired, and at least some strands were loosening and/or breaking:



Once removed from the multi-pin connector, some of the terminals had definitely seen better days:



Fresh terminals, sans connector, in place:



The John Deere in place and wired up:



We both then held our breaths as we started her up.

Eureka!

GEN light out and normal voltage readings:



Note: the Sky Arrow voltmeter has always read about a volt high (1). I tend to trust the bus voltage shown on the Garmin (2).

Anyway, it was late and we were both tired. I'm going to try to get up tomorrow and make sure everything checks out in flight.

Thanks again for the help and I hope this little report may help someone out as well.

PS - Now we just have to get a small "Power by John Deere" decal!

PPS - Is it standard practice to log this change in the Engine or the Airframe logbook or both?

Last edited by Fast Eddie B : 01-14-2017 at 07:48 PM.
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  #10  
Old 01-14-2017, 07:15 PM
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Dvalcik Dvalcik is offline
 
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Eddie

Glad you got it working.
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