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Old 09-29-2022, 05:36 PM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,457

If your troubleshooting isolates the problem to fuselage wiring, one of the first places I would suggest
looking is where the wiring is captured by a metal plate above the rudder pedals.
Since the plane was one of the first ones built, it might not have the "Over Rudder Wireway", Van's part number F-12125
Another suspect area is where the wires pass through the bottom of the instrument panel.
Joe Gores
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Old 10-07-2022, 01:21 PM
thomasyost's Avatar
thomasyost thomasyost is offline
Join Date: Sep 2009
Location: Keaau, HI
Posts: 44

You might want to verify that you are using the correct size fuse.

I only say this because I was watching the RV12 Pilot YouTube videos recently and he had a similar issue where the original fuse size was incorrect and had to be replaced. He mentioned in a subsequent video how there was an instruction to replace the 5a fuse with a 7.5a fuse that was missed.
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Old 10-07-2022, 02:35 PM
RV12Pilot RV12Pilot is offline
Join Date: Jun 2020
Location: Williamson GA
Posts: 36

Thanks for all of the suggestions
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Old 10-07-2022, 03:08 PM
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hevansrv7a hevansrv7a is offline
Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,667

Originally Posted by Mike S View Post

If that doesn't work, look for high resistance like corrosion in the bulb socket, loose screws or push on tabs. Even loose fuse to holder contact.
I am no expert but doesn't a blown fuse say there was too much current at that moment? How would high resistance cause MORE current to flow?
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Old 10-07-2022, 04:56 PM
NinerBikes NinerBikes is offline
Join Date: Dec 2018
Location: Granada Hills
Posts: 1,303

Originally Posted by hevansrv7a View Post
I am no expert but doesn't a blown fuse say there was too much current at that moment? How would high resistance cause MORE current to flow?
High resistance can mean voltage drop, which would/ could increase current flow, to get the same amount of watts required.
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Old 10-07-2022, 05:12 PM
rapid_ascent rapid_ascent is offline
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,779

So the fuse is blowing for excessive current. What that means is somewhere you are probably getting a short to ground as others have mentioned. A couple of common faults are open circuits where one of your lights may not work and a short circuit which would cause the fuse to blow. For that to happen then the wire for your lights has to be touching a ground of some type or the grounded airframe.

This probably means there is some poor workmanship on that circuit. A connector that is not properly insulated or crimped, or a wire who's insulation has been cut and contacting the airframe. You will need to start tracing the wiring. Sometimes wiggling the associated wires may show a problem.
Ray Tonks
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