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grantr
Joined: 12 Sep 2007
Posts: 217
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Wed Sep 17, 2008 4:56 am Post subject: help with wiring |
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> So tell me how in the world can the hour meter run and the volt meter
read 12 volts with the ground side of the battery is completed disconnected
from everything? I did touch the fuel pump lead to the positive side of the
battery and the ground to the frame and it would not run or arc so I am
guessing the engine would not turn over, however the 2.5 volts and the 12
volt readings have me confused.
Grant R:
If you have a large capacitor wired into the 12DVC side of the reg/rec, it
will act as a battery for a very short period of time, enough to operate the
hour meter and show some voltage indications.
john h
mkIII
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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herbgh(at)nctc.com
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| Posted: Wed Sep 17, 2008 5:43 am Post subject: help with wiring |
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second battery somewhere or your charger is hooked up...? Herb
At 07:41 AM 9/17/2008, you wrote:
| Quote: |
Since i got my plane home I have been doing some work on it to get
it like I want it. Anyway I ran into a strange situation yesterday.
I disconnected the ground leads from the battery a few days ago and
yesterday when I turned on the key to me amazement the hour meter
started running/ clicking. After this I took my volt meter and
stuck the ground lead to the airframe and the positive to the
positive side of the battery and got 12 volts. [Question] This
has me confused. Then I disconnected the positive side of the
battery and tried the key again. This time the hour meter did not
run. Then I took my tester and stuck the positive lead to each of
the positive wires. One wire leading to the blue box the voltage
regulator consistently read 2.5 volts.
So tell me how in the world can the hour meter run and the volt
meter read 12 volts with the ground side of the battery is completed
disconnected from everything? I did touch the fuel pump lead to the
positive side of the battery and the ground to the frame and it
would not run or arc so I am guessing the engine would not turn
over, however the 2.5 volts and the 12 volt readings have me confused.
Any ideas?
I didn't try the starter since the plane was folded up [Rolling Eyes]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4750#204750
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George Alexander
Joined: 10 Jan 2006
Posts: 245
Location: SW Florida
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| Posted: Wed Sep 17, 2008 6:56 am Post subject: Re: help with wiring |
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| grantr wrote: |
---- SNIP ----
So tell me how in the world can the hour meter run and the volt meter read 12 volts with the ground side of the battery is completed disconnected from everything? I did touch the fuel pump lead to the positive side of the battery and the ground to the frame and it would not run or arc so I am guessing the engine would not turn over, however the 2.5 volts and the 12 volt readings have me confused.
Any ideas?
|
Grant:
Try disconnecting the Pos (+) side of the rect/reg (blue box? sounds like a Key West) and see if the hour meter continues to run.
There is a small, residual voltage that takes some time to drain off on the output circuitry of the rect/reg. (You may have to wait until you run the engine before you try this one since that residual voltage may have drained off.) Whatever the source, it doesn't take much to click the hour meter over.
I added a relay so that the hour meter will not run unless the engine is powering the rect/reg.
Your other question about the VM reading 12V with the ground side of the battery disconnected.... either got to be another source for the 12V or a ground circuit that you haven't discovered yet.
My $.02 worth......
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George Alexander
FS II R503
E-LSA N709FS
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This has me confused. Then I disconnected the positive side of the battery and tried the key again. This time the hour meter did not run. Then I took my tester and stuck the positive lead to each of the positive wires. One wire leading to the blue box the voltage regulator consistently read 2.5 volts.
