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Old 01-02-2021, 12:50 PM
greg gfeller greg gfeller is offline
Join Date: Jun 2018
Location: Post Falls, Idaho KCOE
Posts: 12
Default Landing light won't pulse

Happy New Year,

I have a 2015 RV-12, 912 ULS, ELSA with a Skyview Touch built with assistance from Synergy Air. My landing light works but will not pulse when switch is the pulse position. Before I rip into the avionics' bay checking pins etc. any suggestions on where to start looking?

Thank You

Last edited by greg gfeller : 01-02-2021 at 03:07 PM. Reason: .
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Old 01-02-2021, 05:00 PM
dreed dreed is offline
Join Date: Nov 2016
Location: Camas, WA
Posts: 503

not 100% sure on Dynon, but some have a time delay before they go into pulse. I think mine (all Advnaced flight) I think it takes about 30 second before hitting the pulse switch before it starts pulsing. Not sure if this is a setting, or by default.

Just a thought in case you've not waited long enough
Dan Reed
Camas, WA
RV-7A - N167DR
First flight 5/25/2021
Phase 1
2018/19/20 VAF dues paid
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Old 01-02-2021, 05:01 PM
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Jpm757 Jpm757 is offline
Join Date: May 2013
Location: Sherman, CT
Posts: 990

I don't know what hardware you have installed, but my AFS/Dynon setup allows for on-screen programming of the wig-wag function. I am using the AFS Advanced Control module.
RV6 #20477 completed 1991 sold.
RV7 #72018 N767T first flight 11/21/2017
(KOXC)Oxford, CT, (0NY0)North Creek, NY.
1941 J3 Cub skis, floats.
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Old 01-02-2021, 07:39 PM
Bob Y Bob Y is online now
Join Date: Jul 2017
Location: Piedmont, SC
Posts: 299

If you don’t have it, download the Electrical schematic and see pages 3 and 8 for the wing light wiring and inputs to the Skyview. Here’s the link to the latest if you don’t have it.

I’d first check the connections at the landing lights to be sure they secure. I had trouble with mine at that point - either loose pins in the connector shell or bad crimps on my part. If that’s not the problem, I’d next pull the wings one at a time to check the wing root connection points by jumpering between the wing and fuselage connection to see if there might be a bad connection. If then not resolved, I’d go the the Skyview.
Bob Y - builder 12iS E-LSA
N569TT first flight 2/9/2020
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Old 01-02-2021, 09:25 PM
John-G John-G is offline
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 759


As previously mentioned you need to have a look at the RV-12 wiring diagram to help with the troubleshooting.

Unless your RV-12 is wired differently than mine, the Dynon Skyview has NOTHING to do with pulsing the landing light nor does airspeed. The RV-12's landing light steady on and pulse modes are controlled solely by the rocker switch on the panel. Power from the landing light fuse is applied to the center terminals of the landing light switch. When the switch is flipped to the landing light position power is applied through the switch, navigates the interconnect board and eventually ends up at pin 35 (yellow/blue stripe wire) on the Options connector and when the switch is flipped to the pulse position, power is applied to pin 31 (yellow wire) on the Options connector. Those wires run down the center tunnel and go to the floating blue Amphenol connector on the side of the fuselage. (If your RV-12 has the old style field of bent tabs which were used as the connection contacts, you should change them out to the blue Amphenol connector because the old style bent tab system was, to be kind, “very problematic”).

At the blue fuselage connector the landing light power is on pin 4 and the pulse power is on pin 5. From there, through the wing to the landing light’s Molex connector at the landing light. Landing light power is applied to pin 5 of the Molex connector (a red wire going to the landing light). The pulse power is applied to pin 4 (a yellow wire going to the landing light).

Of note, if memory serves me correctly, the wires from the landing light to the Molex connector were a small gauge wire and one of the first places I would look at to make sure the wires were crimped properly. Remove the landing light lens and take a close look at the Molex connector and use a volt meter to verify you have power there. Below is a link to a quick method to hold the backing strips in place when you reinstall the lens.

Edit: An additional thought. When you check for voltage on the pulse wire at the landing light's Molex connector, don't just place the volt meter on the input side of the connector and call it good .... try to actually verify that the crimp is good by using a pin or needle to actually get onto the bare wire on the light side of the Molex connector pin. You could also verify the light itself is working properly by unplugging the Molex connector and apply +12 volts to the yellow wire on pin 4 and attach the ground for the test battery on the black wire connected to pin 1 ... the light should pulse. You may be able to use a 9v transistor radio battery. I have used a fresh 9v battery to test that the light works, but did not try to make it pulse with 9v, so that may not work ... but easy enough to try if you don't have easy access to a 12 volt battery.

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Last edited by John-G : 01-03-2021 at 10:15 AM.
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Old 01-03-2021, 12:54 PM
greg gfeller greg gfeller is offline
Join Date: Jun 2018
Location: Post Falls, Idaho KCOE
Posts: 12

Thank you for everyone's response. Bob Y and John G your guidance is very much appreciated and helpful. Looks like I was going to tackle the job on the wrong end first. Bob Y, I have the Vans RV 12 usb stick but am still learning how to find my way around. The schematic is helpful. John-G thanks for the detailed write up also. As an FYI I have spent countless hours on your website! I will take a look when back at the hanger, weather has not been at all conducive to flying lately in North Idaho and doing my condition inspection this month. Once again thank you!

Greg Gfeller
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