Today's Message Index:
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1. 05:41 AM - Re: Electrical Issue (Mike Chaney)
2. 06:28 PM - Re: Electrical Issue (Noel Loveys)
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| Subject: | Re: Electrical Issue |
Thanks for all the comments. I installed another ground wire from the bus bar,
this didn't help the situation. I will look at a few other solutions mentioned
as well. What I find interesting is the degree to which the push to talk button
causes the oil pressure needle to move. My plane is pretty basic and I
don't have a lot of electronics installed. I suppose I could begin disconnecting
items one by one but not sure this would get me any closer to a solution.
I'm not sure how big a problem this is. It could have been an issue for some time.
It's really noticeable when I use the PTT button which is when I'm looking
outside for traffic and not at my panel.
Mike
Sent from my iPad
> On Jul 7, 2017, at 4:48 PM, Guy Buchanan <gebuchanan@cox.net> wrote:
>
>
> Make sure you check the oil pressure sender ground. As to current with no battery,
it's possible with a slowly discharging capacitor, but unless there's another
battery in the system the current should eventually reach zero. Also, I
have had ground straps go bad, but the first sign is difficulty starting, which
I don't think you're having.
>
> Guy Buchanan
> Ramona, CA
> Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs
> Glider pilot, too
>
>
>
>> On 7/7/2017 9:18 AM, Mike Chaney wrote:
>>
>> Thanks for the comments. My battery is grounded to the engine and I cleaned
the connection, problem remained.
>> My ground bus bar is grounded to the frame which from what you guys are saying
could be a problem. To check this I will connect this ground in a better location.
>> I did notice that there is a small amount of current registering on the radio
side of my toggle switch when it is switched off. Is there some residual power
in the radio? I even disconnected the battery neg. terminal and it was still
there.
>> Mike
>>
>> Sent from my iPad
>>
>>> On Jul 6, 2017, at 6:50 PM, Michael Gibbs <michaelgibbs@cox.net> wrote:
>>>
>>>
>>> I agree with Guy. I think a lot of times builders decide that using the fuselage
weldment as a ground is the easy solution but, in my experience, it seldom
provides reliable performance. My starter solenoid was originally wired that
way and it seemed like everything was good but, after a while, I realized it
was only working intermittently. Running a wire from the solenoid to a good ground
fixed the problem.
>>>
>>> Mike G.
>>> Phoenix, AZ
>>> Kitfox IV-1200 Speedster/Series 7
>>>
>>>> On Jul 6, 2017, at 2:06 PM, Guy Buchanan <gebuchanan@cox.net> wrote:
>>>>
>>>>
>>>> Ima gonna say bad ground, somewhere. The oil pressure is voltage based so
any time an additional electrical load causes a voltage variation to the sender
it will change the signal. If your's is a single wire sender then the sender's
trying to ground through it's attachment, which can frequently be a problem.
I changed my single wire sender to a double wire with dedicated ground for that
reason. Otherwise there might be a problem with your engine ground strap.
>>>>
>>>> Guy Buchanan
>>>> Ramona, CA
>>>> Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs
>>>> Glider pilot, too
>>>>
>>>>
>>>>
>>>>> On 7/6/2017 11:19 AM, Mike Chaney wrote:
>>>>>
>>>>> I would like to throw an issue to the group to see If there are any suggestions.
>>>>> This involves a Kitfox IV with Jabiru 2200 .
>>>>> Before departure last week I pushed the "push to talk" button to announce
my intentions and noticed my electrical oil pressure gauge needle went down.
The engine continued to run fine. When I released the PTT button the gauge indicated
normal again. If fact any time I turned on a electrical device; strobes
or transponder, the oil pressure needle went down.
>>>>>
>>>>> I have checked for loose wires, chafed wires, loose connections and found
nothing. I replace the oil pressure gauge and the problem persisted.
>>>>>
>>>>> I am in no way an electrical expert and not sure if I even understand the
problem let alone solve the problem. I didn't just change the oil pressure gauge
as a shot in the dark hoping for a fix, there were a few other things which
didn't seem right with the gauge. However, I really don't want to begin buying
and replacing parts just to see if it fixes the problem. This can get expensive.
>>>>> Any comment are welcome.
>>>>> Mike
>>>>> 1996 Kitfox IV, Jabiru 2200
>>>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>
>
>
>
Message 2
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| Subject: | Electrical Issue |
I go along with the rest of the crowd. The problem sounds like a bad ground.
Since your battery is grounded to the engine the sender should get full clean
voltage. However your instrument may not... First thing I would do is put a
nice healthy grounding strap from the engine to the frame of the plane.
If your radio is a digital unit with memories on it that may be the little leak
you are noticing. There is a certain amount of current used to keep memories
in the radio intact.
Noel
-----Original Message-----
From: owner-kitfox-list-server@matronics.com [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Guy Buchanan
Sent: Friday, July 7, 2017 6:18 PM
Subject: Re: Kitfox-List: Electrical Issue
Make sure you check the oil pressure sender ground. As to current with no battery,
it's possible with a slowly discharging capacitor, but unless there's another
battery in the system the current should eventually reach zero. Also, I have
had ground straps go bad, but the first sign is difficulty starting, which
I don't think you're having.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs Glider pilot, too
On 7/7/2017 9:18 AM, Mike Chaney wrote:
>
> Thanks for the comments. My battery is grounded to the engine and I cleaned
the connection, problem remained.
> My ground bus bar is grounded to the frame which from what you guys are saying
could be a problem. To check this I will connect this ground in a better location.
> I did notice that there is a small amount of current registering on the radio
side of my toggle switch when it is switched off. Is there some residual power
in the radio? I even disconnected the battery neg. terminal and it was still
there.
> Mike
>
> Sent from my iPad
>
>> On Jul 6, 2017, at 6:50 PM, Michael Gibbs <michaelgibbs@cox.net> wrote:
>>
>> --> <michaelgibbs@cox.net>
>>
>> I agree with Guy. I think a lot of times builders decide that using the fuselage
weldment as a ground is the easy solution but, in my experience, it seldom
provides reliable performance. My starter solenoid was originally wired that
way and it seemed like everything was good but, after a while, I realized it
was only working intermittently. Running a wire from the solenoid to a good ground
fixed the problem.
>>
>> Mike G.
>> Phoenix, AZ
>> Kitfox IV-1200 Speedster/Series 7
>>
>>> On Jul 6, 2017, at 2:06 PM, Guy Buchanan <gebuchanan@cox.net> wrote:
>>>
>>>
>>> Ima gonna say bad ground, somewhere. The oil pressure is voltage based so any
time an additional electrical load causes a voltage variation to the sender
it will change the signal. If your's is a single wire sender then the sender's
trying to ground through it's attachment, which can frequently be a problem.
I changed my single wire sender to a double wire with dedicated ground for that
reason. Otherwise there might be a problem with your engine ground strap.
>>>
>>> Guy Buchanan
>>> Ramona, CA
>>> Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs Glider pilot, too
>>>
>>>
>>>
>>>> On 7/6/2017 11:19 AM, Mike Chaney wrote:
>>>>
>>>> I would like to throw an issue to the group to see If there are any suggestions.
>>>> This involves a Kitfox IV with Jabiru 2200 .
>>>> Before departure last week I pushed the "push to talk" button to announce
my intentions and noticed my electrical oil pressure gauge needle went down.
The engine continued to run fine. When I released the PTT button the gauge indicated
normal again. If fact any time I turned on a electrical device; strobes
or transponder, the oil pressure needle went down.
>>>>
>>>> I have checked for loose wires, chafed wires, loose connections and found
nothing. I replace the oil pressure gauge and the problem persisted.
>>>>
>>>> I am in no way an electrical expert and not sure if I even understand the
problem let alone solve the problem. I didn't just change the oil pressure gauge
as a shot in the dark hoping for a fix, there were a few other things which
didn't seem right with the gauge. However, I really don't want to begin buying
and replacing parts just to see if it fixes the problem. This can get expensive.
>>>> Any comment are welcome.
>>>> Mike
>>>> 1996 Kitfox IV, Jabiru 2200
>>>>
>>
>>
>>
>>
>
>
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