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ronburnett(at)charter.net
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 Posted: Tue Jun 16, 2020 1:00 pm Post subject: Battery test |
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When I test my battery with a voltmeter it is 12.5 across the main posts. If I test the positive and move the negative lead to the firewall ground post, it is 11.7. Is this normal?
Electrically challenged.
Thanks,
Ron Burnett
May you have the Lord's blessings today!
Sent from my iPad
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ceengland7(at)gmail.com
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| Posted: Tue Jun 16, 2020 1:29 pm Post subject: Battery test |
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On Tue, Jun 16, 2020 at 4:06 PM Ron Burnett <ronburnett(at)charter.net (ronburnett(at)charter.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: Ron Burnett <ronburnett(at)charter.net (ronburnett(at)charter.net)>
When I test my battery with a voltmeter it is 12.5 across the main posts. If I test the positive and move the negative lead to the firewall ground post, it is 11.7. Is this normal?
Electrically challenged.
Thanks,
Ron Burnett
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I'll bet that if you measure from the firewall ground post to the battery negative, you'll see ~0.7V. That means you have enough resistance in that path to drop 0.7V in the path from firewall post to negative battery terminal.
Is starter rotation sluggish?
Charlie
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Tue Jun 16, 2020 1:48 pm Post subject: Re: Battery test |
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No, that is not normal. Is the master switch turned on and aircraft electrical
loads turned on during this test? I suggest taking apart all connectors
between the battery negative post and the firewall ground post. Clean them
and make sure the crimps are good. Then put it back together.
You wrote "test the positive". Is the positive voltmeter probe touching the battery
positive post and the negative voltmeter probe touching the firewall ground post?
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Joe Gores |
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ronburnett(at)charter.net
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| Posted: Tue Jun 16, 2020 4:38 pm Post subject: Battery test |
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The master and no loads were on. I did have the probe on the positive terminal and when the negative probe was moved to the bolt head on the firewall with the forest of tabs inside the cabin, is where it dropped.7 volts.
Will do as you suggested when I can.
Ron Burnett
May you have the Lord's blessings today!
Sent from my iPad
| Quote: | On Jun 16, 2020, at 4:54 PM, user9253 <fransew(at)gmail.com> wrote:
No, that is not normal. Is the master switch turned on and aircraft electrical
loads turned on during this test? I suggest taking apart all connectors
between the battery negative post and the firewall ground post. Clean them
and make sure the crimps are good. Then put it back together.
You wrote "test the positive". Is the positive voltmeter probe touching the battery
positive post and the negative voltmeter probe touching the firewall ground post?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496866#496866
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