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                           Avionics-List Digest Archive
                                      ---
                     Total Messages Posted Sat 04/12/03: 2
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Today's Message Index:
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     1. 10:45 AM - Battery Solenoid (Relay)  (David J. Spencer)
     2. 03:24 PM - Re: Battery Solenoid (Relay)  (Martini Luc J.R.)
 
 
 
________________________________  Message 1  _____________________________________


Time: 10:45:54 AM PST US
From: "David J. Spencer" <djs@54Transmission.com>
Subject: Avionics-List: Battery Solenoid (Relay)

--> Avionics-List message posted by: "David J. Spencer" <djs@54Transmission.com>

Hi all...

Has anyone ever replaced the battery relay on their Beech A23-24 Super III?

 My relay seems to work fine, but is 36 y/o and uses a Kipvolt Voltage
 suppressor (diode) to eliminate voltage spikes flushing through the system.

 I am replacing the battery, ground and starter cables with new cable (AC
 grade #0 wire for the 40 amp system) and am wondering if anyone has put in
a
 new Aircraft grade battery relay from an aircraft supply (Spruce) source
 battery relay in place of ours.

 I can currently remove the battery, diode and battery rely and get current
 continuity (VOM)  through the system from the positive cable to the
negative cable or any
 ground...  everything is off... i.e switches, breaker etc. This is what
some
 people think is causing a "hum" in the radios.  The "hum" is present with
 the engine off and running the radios off a fully charged battery.  .
 Additionally, using the AC voltage test setup on the VOM I can detect
 current flow between the positive cable and ground... any ground.


 I'm using certer point grounding, but all the avionics manual articles
point
 to RMI induced noise through the hull by poor shielding on the DC power
 lines.

 Beech doesn't seem to have these parts anymore.

 All comments welcomed...

 David J. Spencer
 Super3
 djs@54Transmission.com






________________________________  Message 2  _____________________________________


Time: 03:24:56 PM PST US
From: "Martini Luc J.R." <martini@foxinternet.net>
Subject: Re: Avionics-List: Battery Solenoid (Relay)

--> Avionics-List message posted by: "Martini Luc J.R." <martini@foxinternet.net>

What resistance do you read between the battery cable and ground.  Be sure
to take the measurement with the leads swapped as well as standard polarity,
i.e. red lead to + and black to -..  If you are NOT using a digital VOM,
then also take values in both polarities in more than one RANGE on the VOM
(active devices - diodes /transistors - are non-linear.. give you a good
clue if the value changes). You may have another noise suppression diode
somewhere, and/or an RC type (Band Pass) noise filter , with possibly a bad
capacitor in it.

Let me know what you get.

Luc Martini
----- Original Message -----
From: "David J. Spencer" <djs@54Transmission.com>
Subject: Avionics-List: Battery Solenoid (Relay)


> --> Avionics-List message posted by: "David J. Spencer"
<djs@54Transmission.com>
>
> Hi all...
>
> Has anyone ever replaced the battery relay on their Beech A23-24 Super
III?
>
>  My relay seems to work fine, but is 36 y/o and uses a Kipvolt Voltage
>  suppressor (diode) to eliminate voltage spikes flushing through the
system.
>
>  I am replacing the battery, ground and starter cables with new cable (AC
>  grade #0 wire for the 40 amp system) and am wondering if anyone has put
in
> a
>  new Aircraft grade battery relay from an aircraft supply (Spruce) source
>  battery relay in place of ours.
>
>  I can currently remove the battery, diode and battery rely and get
current
>  continuity (VOM)  through the system from the positive cable to the
> negative cable or any
>  ground...  everything is off... i.e switches, breaker etc. This is what
> some
>  people think is causing a "hum" in the radios.  The "hum" is present with
>  the engine off and running the radios off a fully charged battery.  .
>  Additionally, using the AC voltage test setup on the VOM I can detect
>  current flow between the positive cable and ground... any ground.
>
>
>  I'm using certer point grounding, but all the avionics manual articles
> point
>  to RMI induced noise through the hull by poor shielding on the DC power
>  lines.
>
>  Beech doesn't seem to have these parts anymore.
>
>  All comments welcomed...
>
>  David J. Spencer
>  Super3
>  djs@54Transmission.com
>
>