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A36 standby battery and relay

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toaster73(at)embarqmail.c
Guest

Posted: Fri Jul 06, 2018 8:50 am Post subject: A36 standby battery and relay

Bob/List

I am kind of on the sidelines of troubleshooting an A36 Bonanza with a G1000 system. The plane has a B&C standby alternator and cross tie relay that functions related to engine rpm, best I can tell. The alternator doesn't seem to be charging the battery - found the crimp under the protective boot on the alternator output to be quite loose such that the wire pulled right out. Fixed that and still the G1000 goes dark once the main bus is turned off and the backup bus (2nd battery) is on. It seems as though the standby battery relay is not working. The standby battery is new reading 24 volts. Getting that reading required great contortions under the passenger side of the panel. Its a concord battery with a cannon plug connection. The main question is where physically is the relay for this battery - no one seems to know, even the helper on the Beech service line did not know. We would like to get to this relay and see if it is the culprit causing the panel to go dark when main power is off.

Thanks

Chris Lucas

RV-10 

Aircam

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nuckolls.bob(at)aeroelect
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Posted: Fri Jul 06, 2018 10:59 am Post subject: A36 standby battery and relay

At 11:49 AM 7/6/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Chris <toaster73(at)embarqmail.com>



 Bob/List

 I am kind of on the sidelines of troubleshooting an A36 Bonanza with a G1000 system. The plane has a B&C standby alternator and cross tie relay that functions related to engine rpm, best I can tell. The alternator doesn't seem to be charging the battery - found the crimp under the protective boot on the alternator output to be quite loose such that the wire pulled right out. Fixed that and still the G1000 goes dark once the main bus is turned off and the backup bus (2nd battery) is on. It seems as though the standby battery relay is not working. The standby battery is new reading 24 volts. Getting that reading required great contortions under the passenger side of the panel. Its a concord battery with a cannon plug connection. The main question is where physically is the relay for this battery - no one seems to know, even the helper on the Beech service line did not know. We would like to get to this relay and see if it is the culprit causing the panel to go dark when main power is off. 	




   Do you have the Beech maintenance data on the airplane?

   Those books pretty much show where everything is at and

   includes wiring diagrams that show how its all wired

   up. Have standby alternator operations been reviewed

   per the POH?  It's been ten years since I saw those

   drawings and they are fuzzy at best and may even have

   been modified. The way we USED to put them in, the

   s/b alternator and battery were independent of each

   other. The s/b alternator should be able to boost

   the main bus with the main battery on whether or

   not any auxiliary batteries were present.



   If you don't have the books, you're looking for

   a black cat in a coal mine at midnight.



 

 

   Bob . . .

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toaster73(at)embarqmail.c
Guest

Posted: Fri Jul 06, 2018 11:54 am Post subject: A36 standby battery and relay

Bob/List



I am kind of on the sidelines of troubleshooting an A36 Bonanza with a

G1000 system. The plane has a B&C standby alternator and cross tie

relay that functions related to engine rpm, best I can tell. The

alternator doesn't seem to be charging the battery - found the crimp

under the protective boot on the alternator output to be quite loose such

that the wire pulled right out. Fixed that and still the G1000 goes dark

once the main bus is turned off and the backup bus (2nd battery) is on.

It seems as though the standby battery relay is not working. The standby

battery is new reading 24 volts. Getting that reading required great

contortions under the passenger side of the panel. Its a concord battery

with a cannon plug connection. The main question is where physically is

the relay for this battery - no one seems to know, even the helper on the

Beech service line did not know. We would like to get to this relay and

see if it is the culprit causing the panel to go dark when main power is

off.





  Do you have the Beech maintenance data on the airplane?

  Those books pretty much show where everything is at and

  includes wiring diagrams that show how its all wired

  up. Have standby alternator operations been reviewed

  per the POH?  It's been ten years since I saw those

  drawings and they are fuzzy at best and may even have

  been modified. The way we USED to put them in, the

  s/b alternator and battery were independent of each

  other. The s/b alternator should be able to boost

  the main bus with the main battery on whether or

  not any auxiliary batteries were present.



  If you don't have the books, you're looking for

  a black cat in a coal mine at midnight.





  Bob . . .

They book part is being worked... more info to come...



-Chris

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Fri Jul 06, 2018 1:46 pm Post subject: A36 standby battery and relay

Chris:

Bypass the relay.  Turn off the MAIN Master - Supply backup battery voltage to the connection where the backup should be connecting to the G1000.  If all works than - Keep LQQKing at the backup battery relay.  If it does not work, start looking elsewhere.

Barry

On Fri, Jul 6, 2018 at 2:58 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 	  Quote: 	
		    At 11:49 AM 7/6/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Chris <toaster73(at)embarqmail.com (toaster73(at)embarqmail.com)>



 Bob/List

 I am kind of on the sidelines of troubleshooting an A36 Bonanza with a G1000 system. The plane has a B&C standby alternator and cross tie relay that functions related to engine rpm, best I can tell. The alternator doesn't seem to be charging the battery - found the crimp under the protective boot on the alternator output to be quite loose such that the wire pulled right out. Fixed that and still the G1000 goes dark once the main bus is turned off and the backup bus (2nd battery) is on. It seems as though the standby battery relay is not working. The standby battery is new reading 24 volts. Getting that reading required great contortions under the passenger side of the panel. Its a concord battery with a cannon plug connection. The main question is where physically is the relay for this battery - no one seems to know, even the helper on the Beech service line did not know. We would like to get to this relay and see if it is the culprit causing the panel to go dark when main power is off. 	




   Do you have the Beech maintenance data on the airplane?

   Those books pretty much show where everything is at and

   includes wiring diagrams that show how its all wired

   up. Have standby alternator operations been reviewed

   per the POH?  It's been ten years since I saw those

   drawings and they are fuzzy at best and may even have

   been modified. The way we USED to put them in, the

   s/b alternator and battery were independent of each

   other. The s/b alternator should be able to boost

   the main bus with the main battery on whether or

   not any auxiliary batteries were present.



   If you don't have the books, you're looking for

   a black cat in a coal mine at midnight.



 

 

   Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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