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Old 10-21-2017, 07:13 PM
tomkk's Avatar
tomkk tomkk is offline
Join Date: Apr 2014
Location: Port Orange, Fl
Posts: 676

What charge voltage do you see with this regulator?
Port Orange, Fl
RV-12 N121TK ELSA #120845
First flight 06/10/2015
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Old 10-22-2017, 03:10 PM
Dave12 Dave12 is offline
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,276

Originally Posted by ramrod25 View Post
Would recommed NAPA Part# SME 7068102

About $100 bucks

Mount on cockpit side of firewall with a 12V computer fan blowing on regulator.

My fan is about 5" diameter wired to master switch.

Have been flying with this regulator for 18 months with no issues after my ducatti burned out.

Heat is the enemy of these regulators.

Did the same thing a year ago/150 hrs. . I used a 30$ amazon clone and a two inch cooling fan that cost about 4$. The power come right off the hot terminal on the regulator. Switched by the master. Charge rate is typically 14.2 volts. Very satisfied so far.
Proud Dad of a Navy Corpsman
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N588DF RV12 #336 Sold
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Old 10-23-2017, 09:26 PM
ramrod25 ramrod25 is offline
Join Date: Nov 2015
Location: Hugo
Posts: 4

Mine runs 14.7 volts at cruise rpm.

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Old 11-29-2017, 02:18 PM
bruceflys bruceflys is offline
Join Date: Aug 2014
Location: Ocala, FL (Leeward Air Ranch)
Posts: 95
Default John Deere Update

My wife's RV-12 ELSA originally had an under-the-panel $180 Ducati voltage regulator that lasted 120 hrs, followed by a JD $20 replacement that failed yesterday after 150 hrs.

Five minutes after takeoff I smelled hot electrical insulation, the EFIS lady screamed "warning," the voltage digital readout flashed red 29.9 volts, and I instinctively grabbed and removed the 30A generator fuse while wisps of smoke flowed from the center panel.

A friend flying from the left seat turned off the master switch and controlled the airplane while I tried to figure where to aim the fire extinguisher. Simultaneously I pondered why the light smoke continued with everything but the Dynon backup battery deactivated. Then I realized the generator fuse probably disconnected downstream of the VR, meaning the generator was still feeding it. Yanking the wires off the VR killed the smoke. We restored the master and flew home using the ship's battery.

Fortunately when I bought the JD unit, I bought a spare too. Also I installed nutplates to mount it. Putting in the spare, working only from under the panel took ten minutes. During a flight today, the new JD produced 14.1 vdc.

The first JD unit was a bit flakey during its life as the buss voltage varied from 14.0 to 14.4 vdc regardless of load. Its temperature also varied from warm to hot, but usually showed 140F on a non-contact thermometer. So when the voltage began to work higher over the last few flights, I thought that it was normal variation for this VR. Finally it settled at 14.7, which is the top of the charging range acceptable to Odyssey.

Now I realize that the rising output was warning of coming failure. When I see that again, I will prophylactically put in the new spare that I just ordered from Amazon.

RV-10 - 95% complete project For Sale
RV-12 - built for wife now flying light sport
SeaRey flying 2012 - Sold 2017
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Last edited by bruceflys : 11-29-2017 at 02:21 PM.
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Old 11-29-2017, 05:31 PM
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tomkk tomkk is offline
Join Date: Apr 2014
Location: Port Orange, Fl
Posts: 676

I always thought heat was the biggest problem those V.R.s had (the heat they dissipated doing their job, not ambient temp they live in). Every V.R. I've tried, two Ducattis and, I think, three different J.D.s, have run too hot to touch. What I'm trying now is to mount a small computer cooling fan I had lying about directly to the V.R. I actually tie-wrapped it directly to the cooling fins, blowing air up into the fins. So far, the two V.R.s I've tried that both ran really cool. I guess we'll see how well the J.D. I have in now lasts.
Port Orange, Fl
RV-12 N121TK ELSA #120845
First flight 06/10/2015
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Old 12-03-2017, 06:12 AM
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Skunkworks Skunkworks is offline
Join Date: Jun 2012
Location: Douglassville, PA
Posts: 55
Thumbs up 680hrs and still ticking Ducati voltage regulator

Made one change to fix this problem.
Cut a spoon shaped scoop on the end of the blast tube and made it stick out into the air stream.
RV-12 ELSA N470MB S/N 120470
Flying Since March 2013
600 hours as of 12/04/2016:
VAF 2017 Donation Current

Last edited by Skunkworks : 12-03-2017 at 06:23 AM.
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