Today's Message Index:
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1. 09:18 AM - Re: Electrical Issue (Mike Chaney)
2. 01:48 PM - Re: Electrical Issue (Guy Buchanan)
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| Subject: | Re: Electrical Issue |
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: | Re: 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:
>>
>>
>> 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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