Today's Message Index:
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1. 12:55 AM - Re: Alternator will not put out current (John MacCallum)
2. 09:38 AM - Re: Alternator will not put out current (John Miller)
3. 04:55 PM - Re: Overhead Console (Greg McFarlane)
Message 1
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| Subject: | Alternator will not put out current |
I am not familiar with that Alternator. You say you have two wires
running to the connector both with 12 volts? Can you upload a photo of
the wiring diagram for the Alternator?
Also you will always have Battery Volts on the B + terminal whenever the
Master is on unless you have a big Diode in line with the Battery.
Cheers
John MacCallum
VH-DUU
RV 10 # 41016
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of John Miller
Sent: Sunday, 24 December 2017 2:53 PM
Subject: RV10-List: Alternator will not put out current
Fellow RV10 guys.
I am ready to fly the RV8 I have been building for the past 5 years, but
I have an alternator issue maybe one of you can help with.
The alternator I have installed is an Ultima (with internal voltage
regulator) from O=99Reilly=99s auto parts store. My next
door hangar mate has an RV7 with the same alternator setup.
When I did my first ground engine run on Thursday, all worked fine
except the alternator would not put out voltage.
I double checked my connector plug wiring against my hangar mate's, and
and made my connector wiring exactly the same as his is. Then I
confirmed that I had 12v (with alt field switch on) to each of the 2
connectors in the plug, plugged it into the alternator, and ran engine
again but no voltage increase with the alt field switch on.
With the alt field switch, there is no voltage to the connector, but
there is batt voltage showing at the alternator output wire with the
batt switch on.
Friday, I pulled the alternator off and took it back to
O=99Reilly=99s. It bench checked ok on their alternator
tester. I also confirmed on their tester that the 2 connectors had 12v
to them - it did. Then I had them order a new alternator anyway and it
bench checked ok before I left the store..
Put the new alternator on this am. Ops checked it this afternoon with
an engine run and also ran a temp lead from the alternator output
connector to a voltmeter. The alternator output never went above the
battery voltage of 12.7v with the alt field switch on.
Thinking it might be the connector plug that plugs into the back of the
alternator, I changed out that plug for an older one I had with the
original Denso alternator I had on my RV10. I confirmed that I had 12v
to the 2 connectors with alt field switch on and ran the engine again -
no voltage increase again!
I am at wits end trying to get the alternator to put out voltage when
the engine is runningany of you have suggestions?
Thanks - Grumpy
N184JM
Message 2
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| Subject: | Re: Alternator will not put out current |
Fellow RV10ers - thanks all for the tips. Found the issue and will post
for all to see.
On suggestion from one of the avionics dealers at Osh, they convinced my
partner last summer that we needed to have over-voltage protection on
the alternator to protect avionics.
So we bought one of the small crow-bar types from PlanePower and
installed per their instructions between the circuit breaker and the alt
field switch.
I chased ghosts for several days. Could always get 12v on the field
wire to the rear of the alternator.but that was not telling the
whole story. I needed to see if it was supplying enough amps to excite
the alt field. With the help of a local A&P, we jumped the alt field
wire to the connector prong on the rear of the alternator, then measured
volts at the alternator.should have been 12v..less
than 1v!
That led me back to something in the wiring must be allowing 12v voltage
to pass, but no amps to flow. Then I remembered the over-voltage
protection module I installed, and removed it from the wiring. Bingo!
Got a good 12v at the alternator connection followed by a good engine
run with alternator putting out 14.5v into the system!
I then checked with Christer at SteinAir (who built an RV8 a couple of
years back). He told me this:
1. He does not have such a device on his main alternator
2. He does have one on his little backup alternator mounted on the
vacuum pad
3. All the Garmin products are rated for up to 30v, so he doesn=99t
see a need for one if you are using Garmin stuff (did not discuss Dynon
stuff)
4. Set the voltage warning to 15v to warn you if the alternator starts
to run away (I also set my amp warning flags as well)
So, now all is ready for first flight - hopefully tomorrow when the cold
and winds let up some here in TN.
grumpy
N184JM
> On Dec 27, 2017, at 2:54 AM, John MacCallum
<john.maccallum@bigpond.com> wrote:
>
> I am not familiar with that Alternator. You say you have two wires
running to the connector both with 12 volts? Can you upload a photo of
the wiring diagram for the Alternator?
> Also you will always have Battery Volts on the B + terminal whenever
the Master is on unless you have a big Diode in line with the Battery.
>
>
> Cheers
>
> John MacCallum
> VH-DUU
> RV 10 # 41016
>
>
>
> From: owner-rv10-list-server@matronics.com
<mailto:owner-rv10-list-server@matronics.com>
[mailto:owner-rv10-list-server@matronics.com
<mailto:owner-rv10-list-server@matronics.com>] On Behalf Of John Miller
> Sent: Sunday, 24 December 2017 2:53 PM
> To: rv10-list@matronics.com <mailto:rv10-list@matronics.com>
> Subject: RV10-List: Alternator will not put out current
>
> Fellow RV10 guys.
>
> I am ready to fly the RV8 I have been building for the past 5 years,
but I have an alternator issue maybe one of you can help with.
>
> The alternator I have installed is an Ultima (with internal voltage
regulator) from O=99Reilly=99s auto parts store. My next
door hangar mate has an RV7 with the same alternator setup.
>
> When I did my first ground engine run on Thursday, all worked fine
except the alternator would not put out voltage.
>
> I double checked my connector plug wiring against my hangar mate's,
and and made my connector wiring exactly the same as his is. Then I
confirmed that I had 12v (with alt field switch on) to each of the 2
connectors in the plug, plugged it into the alternator, and ran engine
again but no voltage increase with the alt field switch on.
>
> With the alt field switch, there is no voltage to the connector, but
there is batt voltage showing at the alternator output wire with the
batt switch on.
>
> Friday, I pulled the alternator off and took it back to
O=99Reilly=99s. It bench checked ok on their alternator
tester. I also confirmed on their tester that the 2 connectors had 12v
to them - it did. Then I had them order a new alternator anyway and it
bench checked ok before I left the store..
>
> Put the new alternator on this am. Ops checked it this afternoon with
an engine run and also ran a temp lead from the alternator output
connector to a voltmeter. The alternator output never went above the
battery voltage of 12.7v with the alt field switch on.
>
> Thinking it might be the connector plug that plugs into the back of
the alternator, I changed out that plug for an older one I had with the
original Denso alternator I had on my RV10. I confirmed that I had 12v
to the 2 connectors with alt field switch on and ran the engine again -
no voltage increase again!
>
> I am at wits end trying to get the alternator to put out voltage when
the engine is runningany of you have suggestions?
>
> Thanks - Grumpy
> N184JM
Message 3
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| Subject: | Re: Overhead Console |
Why not build your own ? 023 Ally is good to go with. Just make up side template
out of cardboard/mdf ply etc for full length, windscreen to baggage, then make
the whole thing from three pieces, sides and vent/lights etc surface. Small
lugs bent and pop rivets will hold it altogether and attach, then a sealing/strengthening
glass tape can be used on the joins. Your choice of headlining makes
it your own. Happy to give more info if needed. grbcmcfarlane@gmail.com
Cheers from Western Australia
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