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teamgrumman(at)yahoo.com
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 Posted: Tue Apr 08, 2014 9:10 am Post subject: Stray current |
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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
[quote][b]
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cynamonb
Joined: 22 Sep 2013
Posts: 9
Location: Ft Lauderdale, Fl
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| Posted: Tue Apr 08, 2014 9:26 am Post subject: Stray current |
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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(at)petersonindustries.com
In a message dated 4/8/2014 1:11:32 P.M. Eastern Daylight Time, teamgrumman(at)yahoo.com writes:
| Quote: | 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
|
[quote][b]
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JHOSLER(at)epri.com
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| Posted: Tue Apr 08, 2014 9:33 am Post subject: Stray current |
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What is normal current drain from clock?? My plane can go for months without draining battery.
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of CYNAMONB(at)AOL.COM
Sent: Tuesday, April 08, 2014 1:26 PM
To: teamgrumman-list(at)matronics.com
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(at)petersonindustries.com (bruce(at)petersonindustries.com)
In a message dated 4/8/2014 1:11:32 P.M. Eastern Daylight Time, teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com) writes:
| Quote: |
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
|
==============[/b][/quote] TeamGrumman-List Email Forum -[/b][/quote] :p>[/b][/quote] /o:p>[/b][/quote] >[/b][/quote] gator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List[/b][/quote] ==============[/b][/quote] - MATRONICS WEB FORUMS -[/b][/quote] /o:p>[/b][/quote] http://forums.matronics.com[/b][/quote] ==============[/b][/quote] - List Contribution Web Site -[/b][/quote] pre> -Matt Dralle, List Admin.[/b][/quote] ribution">http://www.matronics.com/contribution[/b][/quote] ==============[/b] [b]
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flying-nut(at)cfl.rr.com
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| Posted: Tue Apr 08, 2014 9:35 am Post subject: Stray current |
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On 4/8/2014 1:10 PM, Gary L Vogt wrote:
| Quote: | 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.
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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
| Quote: | 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.
| Quote: | 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
[quote]
Gary
No virus found in this message.
Checked by AVG - www.avg.com
04/08/14 [b]
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JHOSLER(at)epri.com
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| Posted: Tue Apr 08, 2014 9:42 am Post subject: Stray current |
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Where are the “points” located?
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of Linn Walters
Sent: Tuesday, April 08, 2014 1:35 PM
To: teamgrumman-list(at)matronics.com
Subject: Re: Stray current
On 4/8/2014 1:10 PM, Gary L Vogt wrote:
| Quote: |
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
04/08/14
==============[/b][/quote] TeamGrumman-List Email Forum -[/b][/quote] :p>[/b][/quote] /o:p>[/b][/quote] >[/b][/quote] gator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List[/b][/quote] ==============[/b][/quote] - MATRONICS WEB FORUMS -[/b][/quote] /o:p>[/b][/quote] http://forums.matronics.com[/b][/quote] ==============[/b][/quote] - List Contribution Web Site -[/b][/quote] pre> -Matt Dralle, List Admin.[/b][/quote] ribution">http://www.matronics.com/contribution[/b][/quote] ==============[/b] [b]
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flying-nut(at)cfl.rr.com
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| Posted: Tue Apr 08, 2014 10:33 am Post subject: Stray current |
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On 4/8/2014 1:41 PM, Hosler, John wrote:
| Quote: | <![endif]--> <![endif]-->
Where are the “points” located?
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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
[quote]
From: owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com) [mailto:owner-teamgrumman-list-server(at)matronics.com (owner-teamgrumman-list-server(at)matronics.com)] On Behalf Of Linn Walters
Sent: Tuesday, April 08, 2014 1:35 PM
To: teamgrumman-list(at)matronics.com (teamgrumman-list(at)matronics.com)
Subject: Re: Stray current
On 4/8/2014 1:10 PM, Gary L Vogt wrote:
| Quote: |
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
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> http://forums.matronics.com ============== - List Contribution Web Site - pre> -Matt Dralle, List Admin. ribution">http://www.matronics.com/contribution ==============
No virus found in this message.
Checked by AVG - www.avg.com
04/08/14 [b]
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teamgrumman(at)yahoo.com
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| Posted: Tue Apr 08, 2014 11:10 am Post subject: Stray current |
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I've also seen a plane go for months without draining the battery. The clock is minimal at best. Like I said, this is an odd one. I'm going to look at the switches. I wish there were an easy way to monitor the small 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.
Gary
On Tuesday, April 8, 2014 10:40 AM, "Hosler, John" <JHOSLER(at)epri.com> wrote:
#yiv0205038748 #yiv0205038748 -- _filtered #yiv0205038748 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv0205038748 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv0205038748 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv0205038748 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;} _filtered #yiv0205038748 {font-family:Consolas;panose-1:2 11 6 9 2 2 4 3 2 4;} #yiv0205038748 #yiv0205038748 p.yiv0205038748MsoNormal, #yiv0205038748 li.yiv0205038748MsoNormal, #yiv0205038748 div.yiv0205038748MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;} #yiv0205038748 a:link, #yiv0205038748 span.yiv0205038748MsoHyperlink {color:blue;text-decoration:underline;} #yiv0205038748 a:visited, #yiv0205038748 span.yiv0205038748MsoHyperlinkFollowed {color:purple;text-decoration:underline;} #yiv0205038748 pre {margin:0in;margin-bottom:.0001pt;font-size:10.0pt;} #yiv0205038748 span.yiv0205038748HTMLPreformattedChar {} #yiv0205038748 span.yiv0205038748EmailStyle19 {color:#1F497D;} #yiv0205038748 .yiv0205038748MsoChpDefault {font-size:10.0pt;} _filtered #yiv0205038748 {margin:1.0in 1.0in 1.0in 1.0in;} #yiv0205038748 div.yiv0205038748WordSection1 {} #yiv0205038748 What is normal current drain from clock?? My plane can go for months without draining battery.
From: owner-teamgrumman-list-server(at)matronics.com [mailto:owner-teamgrumman-list-server(at)matronics.com] On Behalf Of CYNAMONB(at)AOL.COM Sent: Tuesday, April 08, 2014 1:26 PM To: teamgrumman-list(at)matronics.com Subject: Re: TeamGrumman-List: 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(at)petersonindustries.com (bruce(at)petersonindustries.com)
In a message dated 4/8/2014 1:11:32 P.M. Eastern Daylight Time, teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com) writes:
| Quote: | 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
|
============== TeamGrumman-List Email Forum - :p> /o:p> > gator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List ============== - MATRONICS WEB FORUMS - /o:p> http://forums.matronics.com ============== - List Contribution Web Site - pre> -Matt Dralle, List Admin. ribution">http://www.matronics.com/contribution ============== [quote] <="_blank" href="http://www.matronics.com/Navigator?TeamGrumman-List">ht --> [b]
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