Avionics-List Digest Archive

Sat 04/12/03


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 10:45 AM - Battery Solenoid (Relay) (David J. Spencer)
     2. 03:24 PM - Re: Battery Solenoid (Relay) (Martini Luc J.R.)
 
 
 


Message 1


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    Time: 10:45:54 AM PST US
    From: "David J. Spencer" <djs@54Transmission.com>
    Subject: 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


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    Time: 03:24:56 PM PST US
    From: "Martini Luc J.R." <martini@foxinternet.net>
    Subject: Re: 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 > >




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