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Rotax Charging System
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PostPosted: Wed Jun 13, 2018 12:41 pm    Post subject: Rotax Charging System Reply with quote

Joe the Ducati has 6 pins instead of 5 for the John Deere. I believe the extra pin on the Ducati is for a large capacitor but the John Deere ones are MOSFET rectifiers which don't need the capacitor? So we could hook up the two AC wires, the B+, the L, and the IGN wires the same as on the Ducati and just remove the cap from the system? Am I making any sense?

On Mon, Jun 11, 2018 at 11:15 AM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
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Search eBay for AM101406 or MIA881279
Chances are that the $20 ones are the same as the more expensive ones.
Note that the terminals are arraigned in a different order than the Ducati.  The mounting holes are also spaced differently.  Be sure to use heat conductive grease on the mounting base to carry heat away.

> Any luck on a part number or a way to determine an appropriate John Deere regulator?


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PostPosted: Wed Jun 13, 2018 1:54 pm    Post subject: Re: Rotax Charging System Reply with quote

Neither the Ducati or John Deere regulator has a terminal specifically for a capacitor, although some installers might connect a capacitor to Ducati terminal R. Terminals B and R are connected together internally. I believe the purpose of the R terminal is not for redundancy, but rather to reduce current through a single terminal. A capacitor is required regardless of which regulator is used. It can be connected to the main power bus. I put a 10 amp fuse in series with mine.
Splice the two wires together that were connected to Ducati terminals B & R and connect to John Deere terminal B+.


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PostPosted: Wed Jun 13, 2018 6:39 pm    Post subject: Rotax Charging System Reply with quote

At 03:41 PM 6/13/2018, you wrote:
Quote:
Joe the Ducati has 6 pins instead of 5 for the John Deere. I believe the extra pin on the Ducati is for a large capacitor but the John Deere ones are MOSFET rectifiers which don't need the capacitor? So we could hook up the two AC wires, the B+, the L, and the IGN wires the same as on the Ducati and just remove the cap from the system? Am I making any sense?

As long as you have a battery on line,
the capacitor serves no demonstrable
purpose.



Bob . . .


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PostPosted: Thu Jun 14, 2018 3:18 am    Post subject: Re: Rotax Charging System Reply with quote

Even if the battery is disconnected, I do not think that the capacitor does much good. When my PC680 failed open, the alternator voltage was unstable. However, Rotax documentation calls for a capacitor. It is best to follow manufacturer's instructions. They might know something that I don't.
Quote:
As long as you have a battery on line,
the capacitor serves no demonstrable purpose.


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PostPosted: Mon Jun 18, 2018 1:07 pm    Post subject: Rotax Charging System Reply with quote

Joe,
can you confirm wiring for the JD voltage regulator please.
B+ = DC + output to capacitor and system
AC = yellow wires from generator
L =  indicator light
IGW = master?
is that right?
thanks
Will

William Daniell

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+57 310 295 0744


On Sun, Jun 10, 2018 at 11:03 AM, user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:
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Ken,
While I have great respect for Mike M. and admire his knowledge, I do disagree with that ending statement.  Heat caused by high current can damage alternator windings.  But the total current is determined by the load, not by the regulator.  I do not think that the Silent Hektik regulator will stress the alternator any more than the Ducati regulator.
  Two years ago I replaced the Ducati regulator in my RV-12 with a cheap John Deere regulator from eBay.  I made an adapter plate using 1/8" aluminum because the mounting holes did not line up.  I used heat conductive grease on both sides of the mounting plate.  A thermocouple attached to the John Deere regulator measured a maximum temperature of 157 degrees Fahrenheit on a 90+ degree day.

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PostPosted: Mon Jun 18, 2018 2:37 pm    Post subject: Re: Rotax Charging System Reply with quote

Will,
Yes, you are correct.


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PostPosted: Mon Jun 18, 2018 6:27 pm    Post subject: Re: Rotax Charging System Reply with quote

Use heat conductive paste between the regulator and aluminum airframe or heat sink. The regulator case should be well grounded. Some installers connect a ground wire to one of the mounting bolts. Forced air cooling will prolong regulator life.

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