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A36 standby battery and relay

 
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toaster73(at)embarqmail.c
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PostPosted: Fri Jul 06, 2018 8:50 am    Post subject: A36 standby battery and relay Reply with quote

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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PostPosted: Fri Jul 06, 2018 10:59 am    Post subject: A36 standby battery and relay Reply with quote

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
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PostPosted: Fri Jul 06, 2018 11:54 am    Post subject: A36 standby battery and relay Reply with quote

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: 675

PostPosted: Fri Jul 06, 2018 1:46 pm    Post subject: A36 standby battery and relay Reply with quote

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 . . .


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