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  #1  
Old 01-21-2023, 01:39 PM
mxhossai mxhossai is offline
 
Join Date: Feb 2018
Location: Ashburn, Virginia
Posts: 64
Default RV12 Shows battery discharge

Hello fellow RV'ers:

So when I turn on the master swith, the two ignitions and run the engine/props, the battery does not show charging. The main battery is almost new, and have no issues starting the engine. After which, would assume alternator takes over and should be charging the battery. But its not, and the volts subsequently drops below 11.5v.

Any thoughts?

I pulled then pushed back back in the generator master fuse with no noticeable effect.

Think its regulartor or some other issue?

Regards,
Monir
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  #2  
Old 01-21-2023, 02:19 PM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 134
Default Voltage regulator.

Check all the usual stuff like wiring and connectors.
Voltage regulator may have failed. Common item to go bad. I put in a $20 John Deere VR. 100+ hours no problem. And for the price, I ordered 2 extra for spares.
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Last edited by Jcurry : 01-21-2023 at 02:26 PM.
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  #3  
Old 01-21-2023, 03:31 PM
mxhossai mxhossai is offline
 
Join Date: Feb 2018
Location: Ashburn, Virginia
Posts: 64
Default

Jack,

Sounds good. I will order one, any particular instruction on installation of it? Do I need to order any compound to be put on or does it come with all needed?

Thanks,
Monir
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  #4  
Old 01-21-2023, 05:02 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,456
Default

A new voltage regulator is unlikely to come with any heat sink compound.
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  #5  
Old 01-22-2023, 07:42 PM
mxhossai mxhossai is offline
 
Join Date: Feb 2018
Location: Ashburn, Virginia
Posts: 64
Default

Joe,

Thanks for your reply. It (https://www.amazon.com/dp/B08SJ4D4X5...roduct_details) will arrive this week, any suggestions on wiring or needed compound etc.?

Regards,
Monir
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  #6  
Old 01-22-2023, 08:19 PM
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Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
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Default

Here is wiring for.John Deere VR...
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  #7  
Old 01-23-2023, 08:54 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,456
Default

Correct me if wrong, but I think that Rotax calls for heat sink compound on spark plug threads.
That same compound can be used between metal parts when mounting the voltage regulator.
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  #8  
Old Yesterday, 04:16 PM
mxhossai mxhossai is offline
 
Join Date: Feb 2018
Location: Ashburn, Virginia
Posts: 64
Default

So, the John Deer wasn't a help (it was only $20, so not a big damage), since I have a Silent Hektik F4120 installed. So any idea how to install it (mine was not built by me). Does it have a compound that it is holding to the firewall side? Also, where to order it?
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  #9  
Old Yesterday, 06:38 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 1,023
Default

The Rotax 912 ULS is equipped with what is really a "generator" not an "alternator" -- see:

https://www.rotaxowner.com/pdf/IM_912_Series_Ed3_R0.pdf

As such the generator does not generate very many amps when the engine is operating at relatively low RPMs -- say 1,800-2,200 RPMs. At such low RPMs the generator will not charge the battery and you may see yellow warning indications and low readings on your Voltage and Amperes gauges. Do your low voltage and amperes indications increase if the engine is operated at typical cruise RPMs? If so, your electrical system may be operating normally. In cruise flight (@ 5,250 RPM) I typically see @ 13.9-14.0 Bat Volts and 1 Bat Amp with all electrical loads operating.
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