Today's Message Index:
----------------------
1. 10:11 AM - Stray current (Gary L Vogt)
2. 10:26 AM - Re: Stray current (CYNAMONB@AOL.COM)
3. 10:33 AM - Re: Stray current (Hosler, John)
4. 10:35 AM - Re: Stray current (Linn Walters)
5. 10:42 AM - Re: Stray current (Hosler, John)
6. 11:33 AM - Re: Stray current (Linn Walters)
7. 12:10 PM - Re: Stray current (Gary L Vogt)
Message 1
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I have a Tiger in my shop that has a battery run down after a couple of wee
ks. -The previous owner (more than 6 years ago) put a switch on the panel
to shut off the clock because, apparently, the battery kept going dead.
-=0A=0AI removed the negative cable and put a voltmeter/ammeter between t
he battery and the ground wire. -With both fuses on the battery removed,
there was no current. -With the clock fuse installed, clock on, 7.54 mAmp
s. -With the clock off and the Hobbs(Note: no Hobbs meter)/Cabin light fu
se installed, lights off, 5.33 mAmps. -Lights on, 8.23 mAmps. -This was
repeatable using several different approaches. -=0A=0AThat is, until I t
urned the cabin lights on and off one time and the current went to zero.
-Is it possible the cabin lights could be drawing current with the lights
off? -=0A=0AGary
Message 2
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| Subject: | Re: Stray current |
Bad cabin light switch that functioned normally after being cycled, maybe
due to internal corrosion? The switch may have been passing some current
but not enough to be noticeable at the bulb.
Bruce Cynamon
bruce@petersonindustries.com
In a message dated 4/8/2014 1:11:32 P.M. Eastern Daylight Time,
teamgrumman@yahoo.com writes:
I have a Tiger in my shop that has a battery run down after a couple of
weeks. The previous owner (more than 6 years ago) put a switch on the panel
to shut off the clock because, apparently, the battery kept going dead.
I removed the negative cable and put a voltmeter/ammeter between the
battery and the ground wire. With both fuses on the battery removed, there was
no current. With the clock fuse installed, clock on, 7.54 mAmps. With
the clock off and the Hobbs(Note: no Hobbs meter)/Cabin light fuse installed,
lights off, 5.33 mAmps. Lights on, 8.23 mAmps. This was repeatable using
several different approaches.
That is, until I turned the cabin lights on and off one time and the
current went to zero. Is it possible the cabin lights could be drawing current
with the lights off?
Gary
Message 3
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What is normal current drain from clock?? My plane can go for months wit
hout draining battery.
From: owner-teamgrumman-list-server@matronics.com [mailto:owner-teamgrumm
an-list-server@matronics.com] On Behalf Of CYNAMONB@AOL.COM
Sent: Tuesday, April 08, 2014 1:26 PM
Subject: Re: TeamGrumman-List: Stray current
Bad cabin light switch that functioned normally after being cycled, mayb
e due to internal corrosion? The switch may have been passing some curren
t but not enough to be noticeable at the bulb.
Bruce Cynamon
bruce@petersonindustries.com<mailto:bruce@petersonindustries.com>
In a message dated 4/8/2014 1:11:32 P.M. Eastern Daylight Time, teamgrumm
an@yahoo.com<mailto:teamgrumman@yahoo.com> writes:
I have a Tiger in my shop that has a battery run down after a couple of w
eeks. The previous owner (more than 6 years ago) put a switch on the pan
el to shut off the clock because, apparently, the battery kept going dead
=2E
I removed the negative cable and put a voltmeter/ammeter between the batt
ery and the ground wire. With both fuses on the battery removed, there w
as no current. With the clock fuse installed, clock on, 7.54 mAmps. Wit
h the clock off and the Hobbs(Note: no Hobbs meter)/Cabin light fuse inst
alled, lights off, 5.33 mAmps. Lights on, 8.23 mAmps. This was repeatab
le using several different approaches.
That is, until I turned the cabin lights on and off one time and the curr
ent went to zero. Is it possible the cabin lights could be drawing curre
nt with the lights off?
Gary
st href="http://www.matronics.com/Navigator?TeamGrumman-List">http://ww
w.matronics.com/Navigator?TeamGrumman-List
s.matronics.com/">http://forums.matronics.com
p://www.matronics.com/contribution">http://www.matronics.com/contribution
Message 4
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| Subject: | Re: Stray current |
On 4/8/2014 1:10 PM, Gary L Vogt wrote:
> I have a Tiger in my shop that has a battery run down after a couple
> of weeks. The previous owner (more than 6 years ago) put a switch on
> the panel to shut off the clock because, apparently, the battery kept
> going dead.
The clock is an impulse type and only draws current for a 1/4 second or
so as it winds itself. Providing the points aren't sticking ....
apparent if the clock has to be reset each flight. Vibration will make
the clock work properly. As the battery runs down the points are more
likely to stick. A quick wipe across the points with emery cloth will
usually 'fix' the clock
> I removed the negative cable and put a voltmeter/ammeter between the
> battery and the ground wire. With both fuses on the battery removed,
> there was no current. With the clock fuse installed, clock on, 7.54
> mAmps. With the clock off and the Hobbs(Note: no Hobbs meter)/Cabin
> light fuse installed, lights off, 5.33 mAmps. Lights on, 8.23 mAmps.
> This was repeatable using several different approaches.
Not being familiar with the tiger but thinking the only accessory
'direct connected' to the battery is the clock and ..... maybe the
cigarette lighter. No telling what else has been installed direct
connected after all these years.
> That is, until I turned the cabin lights on and off one time and the
> current went to zero. Is it possible the cabin lights could be
> drawing current with the lights off?
I'd say possible .... but not probable. If you get the airframe back in
tghe current drain mode ..... check the cabin lights in a dark hangar.
I think the more probable explanation is that in messing around,
climbing in/out etc .... something 'moved' ..... and will move back
again at a later date. I suspect a wire has chafed through somewhere ......
I'm curious what you find .....
Linn
>
> Gary
> *
>
>
> *
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
>
Message 5
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Where are the "points" located?
From: owner-teamgrumman-list-server@matronics.com [mailto:owner-teamgrumm
an-list-server@matronics.com] On Behalf Of Linn Walters
Sent: Tuesday, April 08, 2014 1:35 PM
Subject: Re: TeamGrumman-List: Stray current
On 4/8/2014 1:10 PM, Gary L Vogt wrote:
I have a Tiger in my shop that has a battery run down after a couple of w
eeks. The previous owner (more than 6 years ago) put a switch on the pan
el to shut off the clock because, apparently, the battery kept going dead
=2E
The clock is an impulse type and only draws current for a 1/4 second or s
o as it winds itself. Providing the points aren't sticking .... apparent
if the clock has to be reset each flight. Vibration will make the clock
work properly. As the battery runs down the points are more likely to s
tick. A quick wipe across the points with emery cloth will usually 'fix'
the clock
I removed the negative cable and put a voltmeter/ammeter between the batt
ery and the ground wire. With both fuses on the battery removed, there w
as no current. With the clock fuse installed, clock on, 7.54 mAmps. Wit
h the clock off and the Hobbs(Note: no Hobbs meter)/Cabin light fuse inst
alled, lights off, 5.33 mAmps. Lights on, 8.23 mAmps. This was repeatab
le using several different approaches.
Not being familiar with the tiger but thinking the only accessory 'direct
connected' to the battery is the clock and ..... maybe the cigarette lig
hter. No telling what else has been installed direct connected after all
these years.
That is, until I turned the cabin lights on and off one time and the cu
rrent went to zero. Is it possible the cabin lights could be drawing cur
rent with the lights off?
I'd say possible .... but not probable. If you get the airframe back in
tghe current drain mode ..... check the cabin lights in a dark hangar. I
think the more probable explanation is that in messing around, climbing
in/out etc .... something 'moved' ..... and will move back again at a lat
er date. I suspect a wire has chafed through somewhere ......
I'm curious what you find .....
Linn
Gary
No virus found in this message.
Checked by AVG - www.avg.com<http://www.avg.com>
04/08/14
Message 6
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| Subject: | Re: Stray current |
On 4/8/2014 1:41 PM, Hosler, John wrote:
>
> Where are the "points" located?
>
Inside the clock, attached to the winding arm/clock spring. The clock
winds down until the points close and current flows through an
electromagnet (the coil) which attracts the winding arm with the clock
spring attached. A ratchet/pawl catches and the clock runs .....
It's real obvious when you get the back cover off the clock.
The magnetic impulse function isn't unlike the operation of the electric
fuel pump, which also suffers from dirty points.
Linn
> *From:*owner-teamgrumman-list-server@matronics.com
> [mailto:owner-teamgrumman-list-server@matronics.com] *On Behalf Of
> *Linn Walters
> *Sent:* Tuesday, April 08, 2014 1:35 PM
> *To:* teamgrumman-list@matronics.com
> *Subject:* Re: TeamGrumman-List: Stray current
>
> On 4/8/2014 1:10 PM, Gary L Vogt wrote:
>
> I have a Tiger in my shop that has a battery run down after a
> couple of weeks. The previous owner (more than 6 years ago) put a
> switch on the panel to shut off the clock because, apparently, the
> battery kept going dead.
>
> The clock is an impulse type and only draws current for a 1/4 second
> or so as it winds itself. Providing the points aren't sticking ....
> apparent if the clock has to be reset each flight. Vibration will
> make the clock work properly. As the battery runs down the points are
> more likely to stick. A quick wipe across the points with emery cloth
> will usually 'fix' the clock
>
> I removed the negative cable and put a voltmeter/ammeter between the
> battery and the ground wire. With both fuses on the battery removed,
> there was no current. With the clock fuse installed, clock on, 7.54
> mAmps. With the clock off and the Hobbs(Note: no Hobbs meter)/Cabin
> light fuse installed, lights off, 5.33 mAmps. Lights on, 8.23 mAmps.
> This was repeatable using several different approaches.
>
> Not being familiar with the tiger but thinking the only accessory
> 'direct connected' to the battery is the clock and ..... maybe the
> cigarette lighter. No telling what else has been installed direct
> connected after all these years.
>
> That is, until I turned the cabin lights on and off one time and the
> current went to zero. Is it possible the cabin lights could be
> drawing current with the lights off?
>
> I'd say possible .... but not probable. If you get the airframe back
> in tghe current drain mode ..... check the cabin lights in a dark
> hangar. I think the more probable explanation is that in messing
> around, climbing in/out etc .... something 'moved' ..... and will move
> back again at a later date. I suspect a wire has chafed through
> somewhere ......
>
> I'm curious what you find .....
> Linn
>
> Gary
>
> * *
> * *
> * *
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> 04/08/14
>
> * *
> * *
> ==============TeamGrumman-List Email Forum -:p> /o:p> >
> gator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List==============
> - MATRONICS WEB FORUMS -/o:p>
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> Site -pre> -Matt Dralle, List
> Admin.ribution">http://www.matronics.com/contribution=============
> * *
> *
>
>
> *
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
>
Message 7
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| Subject: | Re: Stray current |
I've also seen a plane go for months without draining the battery. -The c
lock is minimal at best. -Like I said, this is an odd one. -I'm going t
o look at the switches. -I wish there were an easy way to monitor the sma
ll current drain. -At least I know which wire is involved. -I may move
the cabin lights to the main buss. -I never did like the fuses out on the
battery box.=0A=0AGary=0AOn Tuesday, April 8, 2014 10:40 AM, "Hosler, John
" <JHOSLER@epri.com> wrote:=0A =0AWhat is normal current drain from clock??
- My plane can go for months without draining battery.=0A-=0AFrom:owner
-teamgrumman-list-server@matronics.com [mailto:owner-teamgrumman-list-serve
r@matronics.com] On Behalf Of CYNAMONB@AOL.COM=0ASent: Tuesday, April 08, 2
014 1:26 PM=0ATo: teamgrumman-list@matronics.com=0ASubject: Re: TeamGrumman
-List: Stray current=0A-=0A-Bad cabin light switch that functioned norm
ally after being cycled, maybe due to internal corrosion? The switch may ha
ve been passing some current but not enough to be noticeable at the bulb.
=0A-=0A-=0A-=0ABruce Cynamon=0Abruce@petersonindustries.com=0A-=0AI
n a message dated 4/8/2014 1:11:32 P.M. Eastern Daylight Time, teamgrumman@
yahoo.com writes:=0AI have a Tiger in my shop that has a battery run down a
fter a couple of weeks. -The previous owner (more than 6 years ago) put a
switch on the panel to shut off the clock because, apparently, the battery
kept going dead. -=0A>-=0A>I removed the negative cable and put a volt
meter/ammeter between the battery and the ground wire. -With both fuses o
n the battery removed, there was no current. -With the clock fuse install
ed, clock on, 7.54 mAmps. -With the clock off and the Hobbs(Note: no Hobb
s meter)/Cabin light fuse installed, lights off, 5.33 mAmps. -Lights on,
8.23 mAmps. -This was repeatable using several different approaches. -
=0A>-=0A>That is, until I turned the cabin lights on and off one time and
the current went to zero. -Is it possible the cabin lights could be draw
ing current with the lights off? -=0A>-=0A>Gary=0A>-=0A>-=0A>st hre
f="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.matron
ics.com/Navigator?TeamGrumman-List=0A>s.matronics.com/">http://forums.matro
nics.com=0A>p://www.matronics.com/contribution">http://www.matronics.com/co
ntribution=0A>-=0A-=0A-=0A==============
TeamGrumman-List Email Forum - =0A:p>=0A/o:p>=0A>=0Agator?TeamGrumman-List
">http://www.matronics.com/Navigator?TeamGrumman-List =0A======
======== =0A---- - MATRONICS WEB FORUMS - =0A/o:p>
=0Ahttp://forums.matronics.com =0A=============
= =0A-- - List Contribution Web Site - =0Apre>=0A------
- -------------Matt Dralle, List Admin. =0Aributi
on">http://www.matronics.com/contribution =0A==========
=========================0A
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