One more bad Voltage Regulator

[Mitch757]

Dale,

Could you tell me the hole spacing for the JD regulator? I'm going to put in an extra nut plate to account for the difference in dimensions.

Thanks!

Mitch Garner
RV12-120260

[Mich48041]

John Deere regulator adapter plate. Only one hole is countersunk. The forward
end of the JD regulator is bolted to the existing firewall shelf nutplate.
All John Deere regulators might not be the same, depending on the manufacturer.

[DaleB]

I test ran the engine after installing the new regulator. It had been running 13.7 V max even in cruise flight and fluctuating a little, and lower at idle. Now it's at 14.2 V from 1800 RPM up to 4000, rock steady. I'll pack the Ducati as a backup just in case, but I like the fact that I didn't have to cut any wires and can revert at any time.

My level of trust in Chinese electronics design and manufacturing is just as low as it is in Italian electronics design and manufacturing, but at $30 a pop I can justify ordering a spare JD regulator to keep on hand even if I never need it.

[Paris12Man]

Hello, does anyone have the hole pattern measurements for the Ducati regulator? I need measurements of center to center of holes. I'm about to build a plate as described in previous posts. Thanks

[Mich48041]

From drawing in my post 244 above, 4.25 minus 0.625 = 3.625"
Confirmed by measuring hole spacing on the Ducati regulator.

[DaleB]

Quick follow-up. In the past, whenever the plane had been sitting in the hangar for a week or two I'd generally see the battery resting voltage at around 12.5, or roughly 75% charge. That's generally not a good sign, and I was worried that I was about to need a new battery. A few days ago I stopped by the hangar, because it had been parked since my return from Oshkosh. Out of curiosity I poked the meter leads under the cowl... 12.8 V, or close to 100% charge.

I do get a little more noise in the headset with the JD type regulator. It sounds like it could very well be switching noise from the regulator. It's not objectionable, but noticeable. The next time I have the upper cowl off I'll probably see if adding a capacitor helps or not.

[Paris12Man]

Thanks Joe, I just misread your simple drawing. I was thinking 4 holes and you did it in 3. Got it now.

[Mich48041]

I can understand that after looking at Dale's picture. After I made that adapter plate, I think that it would be easier instead to install two new nutplates on the other side of the rudder channel. The disadvantage of doing that is that it will make more holes in the firewall.

[DaleB]

My goal was to not have to install any more nut plates, or order a long bolt. I used the original mounting bolts and some AN3s I happened to have on hand. So basically I did it that way because I'm cheap and lazy.

[KALEWIS]

The time has arrived. 315 Hobbs