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Old 03-04-2017, 06:31 PM
asw20c asw20c is offline
Join Date: Jun 2010
Location: Edgewood, NM
Posts: 155
Default Wiring Harness Woes

Today I cleaned up the WH-00057 aft fuselage wiring harness installation as seen on page 10-25. Not sure how others managed, but I found that some of the wires (specifically C723, C1038, and C1039) that run between the C409P and C410P molex connectors were too long by about 8-10 inches compared to all the other wires. I ran the wiring harness exactly as depicted in the plans, yet the C1036 and C1037 white wires were barely long enough to extend forward of the F-01406 bulkhead, and that the previously mentioned three wires were too long so I had to have them double back on themselves along the bellcrank ribs to make a neat looking installation. Anyone else have a problem with this wiring harness? Otherwise I have been very impressed with the quality of the antenna and rudder cables that have been provided in the kit.
Also I'm wondering what other people might have done to mitigate or prevent any chafing of the two wiring harnesses that get sandwiched between the F-01407 and F-01408 bulkheads and side skins.
Empennage Complete Except for Tips
Wings Underway
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Old 03-04-2017, 08:04 PM
Tilford's Avatar
Tilford Tilford is offline
Join Date: Nov 2008
Location: KY
Posts: 92
Default Yep

I had the exact same situation. I too doubled the long wires back onto themselves, however, I do not plan to leave it that way. Once I'm doing the final fuselage wiring I'll shorten those wires to the proper length.

To prevent chafing in the tight spots I wrapped the wires in wire loom purchased at a local automotive parts store.


RV 14A Emp. Complete
Fuselage in progress.

Last edited by Tilford : 03-04-2017 at 08:07 PM. Reason: Added content.
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Old 03-04-2017, 08:35 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,775

As I have posted in the past, after chasing my tail fixing an RV-14 wiring that used the provided wiring kit I would have saved a lot of time and ended up with a better install if I just scrapped it and started over.

I'm sure I'll get flamed, but I recommend just wiring the plane like you want, and look beyond what someone else thinks is a good idea (like the wiring kit). Consider standard practices like using conduit in the tail instead of tie wrapping wire to aluminum. Another example is there is no practical reason to have the big molex connectors at the baggage compartment aft bulkhead.

Whatever you do, immediately cut off the tiny trim servo connectors and throw them away.

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Old 03-04-2017, 09:09 PM
Mudfly Mudfly is offline
Join Date: Dec 2011
Location: Alpharetta, Ga
Posts: 152
Default Same

I had the same issue. So, after running all the wires and temporarily tie-wrapping in place, I cut those two long wires at the C410 molex plug to match the lengths of the other wires. The pins on the larger molex plugs are easier to work with than the tiny ones on those micro plugs that you probably had the pleasure of working with on the elevator trim servo connectors
The two short white wires are the power wires for the elevator trim servo. I removed those completely and replaced with longer lengths that will hopefully make it to their final termination points (wherever that is), and avoid the connector at the fuselage bulkhead.
Carl may be correct about getting a cleaner install if you avoid using the kit wire harnesses and run the wiring yourself. However, for less experienced builders (me), who don't quite have the "big picture" yet, the pre-done harnesses make things much simpler. Maybe as I get more experience, I will "modify" the kit harnesses here and there to clean things up a bit.
Shawn Edwards
RV-14A (140174)
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Old 05-15-2017, 09:01 PM
coffeeguy coffeeguy is offline
Join Date: Jul 2015
Location: Lake in the Hills, IL
Posts: 106

I was in the same boat tonight. Trying to figure out how to run the empennage wiring took a lot of time. It just didn't make sense, especially with those longer wires. In the end, just muddling thru it was what it took. I am also in the camp of wiring it as per plans and included components and may or may not rework it down the road.
Jeff Dingbaum
RV-14A empennage, wings
Cherokee 180
2018 dues paid
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Old 05-16-2017, 04:49 AM
mturnerb mturnerb is offline
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 767

I just based everything on the two white wires, ended up making a loop in the bundle on the left side of the battery angles and securing with cable tie mount epoxied to the bottom skin. Seems pretty secure and keeps wires clear of the rudder cables. I can always trim these back and re-mount into the molex connector.

I ran some extra wires (red/white/black, 3-wire shielded) from the tail (behind aft-most bulkhead) along the right J-channel with enough length to reach all the way to panel in case I need them for anything, but I'm planning to use factory harnesses and modify as needed - including getting rid of as many micro molex connectors as possible.
Turner Billingsley
RV-14A In Progress
N14VB Reserved

Last edited by mturnerb : 05-16-2017 at 04:51 AM.
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