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B&C voltage regulator low voltage warning

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nuckollsr(at)cox.net
Guest

Posted: Sun Jun 24, 2007 7:19 pm Post subject: B&C voltage regulator low voltage warning

At 06:03 AM 6/24/2007 -0700, you wrote:



 	  Quote: 	
		  



I have a B&C voltage regulator that controls one of their 60-amp,

12volt alternators.  One characteristic of this regulator that has

been there since day one is that immediately upon starting the engine

I get a steady low-voltage light (LED), even though the measured

output voltage is normal.  By the time I do a runup and take off the

light goes off.  It is a steady light, not the flashing light that

would indicate an actual low voltage condition.  I went to a lower

bypass resistor,


	


   ??? bypass resistor? Don't know what that is. Oh, you're using

   a LED. Try hooking a incandescent lamp up temporarily and see

   if that works. The circuit was not originally designed to work

   with LEDs. What LED resistor values are you using?

 	  Quote: 	
		    but it is still there.  Anyone else have the

problem?  For now I just ignore it.


	


   What does it do when the engine is running and the

   alternator is shut off? Does it come back on steady

   or does it flash? I think your resistor values

   need to be reviewed.



   Bob . . .

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Sun Jun 24, 2007 8:07 pm Post subject: B&C voltage regulator low voltage warning

I would like to subsitute an LED for the Low Voltage bulb that came with 

the B&C LR3C-14 . I posed the question to Tim Hedding (at) B&C and received 

this in response.



If you use an LED instead of an incandescent lamp, install a 470 - 510 Ohm,

1/2 Watt, resistor between terminals 3 and 5 of the LR3C-14 (or the SB1B-14)

so that the LED does not glow dimly all of the time.



Deems Davis # 406

Engine / Wiring and Panel Stuff

http://deemsrv10.com/



 	  Quote:

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EricWalker
Guest

Posted: Mon Dec 23, 2019 12:37 am Post subject: Re: B&C voltage regulator low voltage warning

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johnbright

Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA

Posted: Mon Dec 23, 2019 7:34 pm Post subject: Re: B&C voltage regulator low voltage warning

Hi Deems... ref: http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg



 	  Deems Davis wrote: 	
		  I would like to subsitute an LED for the Low Voltage bulb that came with 

the B&C LR3C-14 . I posed the question to Tim Hedding (at) B&C and received 

this in response.



If you use an LED instead of an incandescent lamp, install a 470 - 510 Ohm,

1/2 Watt, resistor between terminals 3 and 5 of the LR3C-14 (or the SB1B-14)

so that the LED does not glow dimly all of the time.



Deems Davis # 406

Engine / Wiring and Panel Stuff

http://deemsrv10.com/



 	  Quote:

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_________________
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
N1921R links

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Dec 26, 2019 10:12 am Post subject: B&C voltage regulator low voltage warning

At 09:34 PM 12/23/2019, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "johnbright" <john_s_bright(at)yahoo.com>



 Hi Deems... ref:  http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg



 

 Deems Davis wrote:

 > I would like to subsitute an LED for the Low Voltage bulb that came with 

 > the B&C LR3C-14 . I posed the question to Tim Hedding (at) B&C and received 

 > this in response.

 > 

 > If you use an LED instead of an incandescent lamp, install a 470 - 510 Ohm,

 > 1/2 Watt, resistor between terminals 3 and 5 of the LR3C-14 (or the SB1B-14)

 > so that the LED does not glow dimly all of the time. 	


   Either of these techniques works . . . in fact,

   Tim's suggestion is probably the most elegant.



 

 

   Bob . . .

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