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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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 Posted: Thu Nov 05, 2020 6:54 am Post subject: ROTAX LANE LIGHTS PROBLEM SOLVED |
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The Rotax 912iS lane LED lights did not work in my friend's Kitfox.
There was a faint flicker when the lane switches were first turned on.
The lights worked fine when a 9 volt battery was connected to the pins in the HIC connector for the lights.
So the problem must be in the Rotax harness or CPU or fuse box, right?
NO
After days of troubleshooting, we decided to remove the LED parallel resistor to see if that made a difference.
Wow, that did it. The LED lane lights now worked.
It turns out that the Kitfox supplied resistors were 1R5 (1.5 ohms), not the recommended 1K5 (1500 ohms).
The purpose of those parallel resistors is to prevent the LEDs from glowing dimly when the Rotax solid state switch is off.
A 9 volt battery has enough current capacity to power both a low value resistor and a LED.
But the Rotax CPU must have internal resistance that limits the current.
Lesson learned: Check load resistance.
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Joe Gores |
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yellowduckduo(at)gmail.co
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| Posted: Thu Nov 05, 2020 9:33 am Post subject: ROTAX LANE LIGHTS PROBLEM SOLVED |
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Another lane light gotcha is finding out that an unadvertised feature of
the indicator lamps purchased from Aircraft Spruce was that they were
internally grounded.
Ken
On 05/11/2020 9:54 AM, user9253 wrote:
| Quote: |
The Rotax 912iS lane LED lights did not work in my friend's Kitfox.
There was a faint flicker when the lane switches were first turned on.
The lights worked fine when a 9 volt battery was connected to the pins in the HIC connector for the lights.
So the problem must be in the Rotax harness or CPU or fuse box, right?
NO
After days of troubleshooting, we decided to remove the LED parallel resistor to see if that made a difference.
Wow, that did it. The LED lane lights now worked.
It turns out that the Kitfox supplied resistors were 1R5 (1.5 ohms), not the recommended 1K5 (1500 ohms).
The purpose of those parallel resistors is to prevent the LEDs from glowing dimly when the Rotax solid state switch is off.
A 9 volt battery has enough current capacity to power both a low value resistor and a LED.
But the Rotax CPU must have internal resistance that limits the current.
Lesson learned: Check load resistance.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499262#499262
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Eric Page
Joined: 15 Feb 2017
Posts: 245
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| Posted: Fri Nov 06, 2020 8:25 am Post subject: Re: ROTAX LANE LIGHTS PROBLEM SOLVED |
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| user9253 wrote: | | The Rotax 912iS lane LED lights did not work in my friend's Kitfox. [SNIP] |
Joe, I hope you don't mind; I re-posted your discovery to the TeamKitfox forum. I wanted to make other Kitfox builders aware, in case the Kitfox factory sent incorrect resistors with more than one 912is installation kit. Thanks for passing along the information.
Eric
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Fri Nov 06, 2020 9:06 am Post subject: Re: ROTAX LANE LIGHTS PROBLEM SOLVED |
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Thanks Eric. My friend purchased the engine 5 years ago. Hopefully Kitfox found and corrected the error by now.
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Joe Gores |
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