TP724 Wire - Where is it?

[rdt7]

Page 10-25 of the Aft Fuselage plans involves installing the WH-00057 wiring harness. The instructions and diagrams refer to a grey/purple TP724 wire. We cannot find that wire. I called Vans Tech Support and they said the was no such wire, even though it's in the plans. Before I close everything up I thought I'd check here.

Does anyone know anything about this wire?

 

[BravoAlphaRomeo]

TP724 is definitely part of my wiring harness running into the aft tail. It breaks off and is part of the ELT install. Just confirmed
that by looking at it.

 

[rdt7]

TP724 is definitely part of my wiring harness running into the aft tail. It breaks off and is part of the ELT install. Just confirmed
that by looking at it.

Is it grey and purple?

 

[MV-RVer]

Just looked at my aft fuselage without tail surfaces and I find no Grey/purple wire. This is a March 2022 shipped harness.

 

[rdt7]

Just looked at my aft fuselage without tail surfaces and I find no Grey/purple wire. This is a March 2022 shipped harness.

The plans say it's grey/purple but it's really just grey (or white - hard to tell). Just wanted to make sure I wasn't missing something. I'll follow the wiring diagram and make sure the wires that come out of the front Molex go to where they are supposed to based on pin # vs. wire color.

 

[BravoAlphaRomeo]

To be fair my wire looks straight white, but is marked right at the end TP724. It is illustrated on 53-04 figure 3. Part of
the ELT Din connector.

 

[Turn and Burn]

Similar issue. Sent email to Vans but haven’t heard anything for several days.

Details:
Page 10-25 (RV-14A), step 4 says to route P725 (WHT/RED) and TP724 (GRY/PRP) wires. Unfortunately my WH-00057 wiring harness doesn’t seem to have those wires (or they’re colored differently).

As you can see in the photos, the WHT/RED was pretty easy to distinguish. However, the subsequent photos show the remainder of the harness ends, none of which seem to be GRY/PRP. By process of elimination, I’m guessing the wires it’s actually referring to are the ones in the second photo containing a GRN and a WHT wire (maaaaybe GRY?), wrapped in a WHT sheath. Is this the TP724 wire the plans refer to?

 

[BravoAlphaRomeo]

Similar issue. Sent email to Vans but haven’t heard anything for several days.

Details:
Page 10-25 (RV-14A), step 4 says to route P725 (WHT/RED) and TP724 (GRY/PRP) wires. Unfortunately my WH-00057 wiring harness doesn’t seem to have those wires (or they’re colored differently).

As you can see in the photos, the WHT/RED was pretty easy to distinguish. However, the subsequent photos show the remainder of the harness ends, none of which seem to be GRY/PRP. By process of elimination, I’m guessing the wires it’s actually referring to are the ones in the second photo containing a GRN and a WHT wire (maaaaybe GRY?), wrapped in a WHT sheath. Is this the TP724 wire the plans refer to?

Looks just like mine, so I would say yes.

 

[FlyingSquirrel]

Hey All,

TP724 is the 22 AWG shielded wire. This will be the only 22-1 wire in this harness, so you cant mix it up with a different one.

We typically do put a label on that wire, but that must have been missed in this instance - Sorry for the confusion.

I highly recommend that every RV-14 builder using Van's harness system download the WH-00125 harness document on Van's website. This is the master drawing that shows all of the Van's wiring harnesses in the system giving you a better understanding of the big picture.

Interestingly enough the TP724 wire is shown as white on that drawing, so I would bet that the Grey/Purple color is a typo (milspec 22-1 comes as a white wire unless you custom order it) that was corrected on some of their documents but not all.

 

[gregsrv14]

Similar issue. Sent email to Vans but haven’t heard anything for several days.

Details:
Page 10-25 (RV-14A), step 4 says to route P725 (WHT/RED) and TP724 (GRY/PRP) wires. Unfortunately my WH-00057 wiring harness doesn’t seem to have those wires (or they’re colored differently).

As you can see in the photos, the WHT/RED was pretty easy to distinguish. However, the subsequent photos show the remainder of the harness ends, none of which seem to be GRY/PRP. By process of elimination, I’m guessing the wires it’s actually referring to are the ones in the second photo containing a GRN and a WHT wire (maaaaybe GRY?), wrapped in a WHT sheath. Is this the TP724 wire the plans refer to?

Your photo IMG_0606 shows a green wire, as depicted in the plans. Mine is black. I wonder if I should I assume that it is TP881...

 

[FlyingSquirrel]

Your photo IMG_0606 shows a green wire, as depicted in the plans. Mine is black. I wonder if I should I assume that it is TP881...

Yes. We window strip and solder in the back wire rather than using several wires in the same joint just to change the color. sorry for the confusion!

 

[gregsrv14]

Yes. We window strip and solder in the back wire rather than using several wires in the same joint just to change the color. sorry for the confusion!

Thank you. To be clear, this is NOT connected to the black wire coming out the back of it? (I will break out the multimeter to confirm.)

Also, do the two white wires, C1036 and C1037, get routed aft all the way to the F-01411 bulkhead before being routed forward all the way back to and through the F-01429-L & -R Bellcrank Ribs before coming out the front of the F-01406B bulkhead?

 

[FlyingSquirrel]

Thank you. To be clear, this is NOT connected to the black wire coming out the back of it? (I will break out the multimeter to confirm.)

Also, do the two white wires, C1036 and C1037, get routed aft all the way to the F-01411 bulkhead before being routed forward all the way back to and through the F-01429-L & -R Bellcrank Ribs before coming out the front of the F-01406B bulkhead?

This wire is the black wire coming out of the other side. Van's plans show a green wire soldered to the shield one way and a black wire soldered to the shield going the other. This creates unnecessary complication and is difficult to do correctly. To solve this we just use one continuous wire and we solder that into the shield, simplifying the manufacturing and increasing the reliability of the connection.

I don't have access to the plans, so I don't know exactly which bulkheads the two white wires are routed through, but that sounds correct. These wires end up on the forward side of the bulkheads an plug into the WH-00125 connector C411P. These will be the only two open contact on this connector.

 

[gregsrv14]

This wire is the black wire coming out of the other side. Van's plans show a green wire soldered to the shield one way and a black wire soldered to the shield going the other. This creates unnecessary complication and is difficult to do correctly. To solve this we just use one continuous wire and we solder that into the shield, simplifying the manufacturing and increasing the reliability of the connection.

I don't have access to the plans, so I don't know exactly which bulkheads the two white wires are routed through, but that sounds correct. These wires end up on the forward side of the bulkheads an plug into the WH-00125 connector C411P. These will be the only two open contact on this connector.

Thank you! That's good to know since I just discovered that they are indeed connected.

Here is the page showing the routing and wiring. In the aftmost breakout, it looks like L1082 is fed forward through the lightening hole than back aft through the small oval hole (same as on the other side). L1082 will not fit through that little hole, so I'm wondering if I am properly interpreting things.

 

[FlyingSquirrel]

Thank you! That's good to know since I just discovered that they are indeed connected.

Here is the page showing the routing and wiring. In the aftmost breakout, it looks like L1082 is fed forward through the lightening hole than back aft through the small oval hole (same as on the other side). L1082 will not fit through that little hole, so I'm wondering if I am properly interpreting things.

Thanks for the additional information! Those wires start at the connector in F-01406B then are routed aft with the harness to the next bulkhead F-01407 where they cross through the longerons.



Once they have crossed to the other side they route forward and pass through bulkhead F-01406B and are pinned into the forward side of the connector that is there.



I hope this makes sense!

 

[gregsrv14]

Thanks for the additional information! Those wires start at the connector in F-01406B then are routed aft with the harness to the next bulkhead F-01407 where they cross through the longerons.

View attachment 110474

Once they have crossed to the other side they route forward and pass through bulkhead F-01406B and are pinned into the forward side of the connector that is there.

View attachment 110475

I hope this makes sense!

Ok, I'm pretty sure I get it now! But please correct me if I'm wrong.

Everything begins at plug C410P attached to the F-01406B bulkhead. It all gets tie-wrapped along the left bellcrank, then along the bottom and up the left side (right side of image) of the F-01407 bulkhead, then along the channel of the F-01486A-L stiffener all the way back to the F-01410 bulkhead.
At that point, TP 725 and TP724 are picked off and everything else is run through the F-01411 bulkhead.

The mistake I made, which is also why I was confused, was to pull ALL the wires through to that point, including C1036 and C1037, because then I had to thread them all the way forward, back to the forward bay between F-01406B and F-01407 - right where they were to begin with. From there, C1036 and C1037 go through both bellcranks and come out the right, forward side of the F-01406B bulkhead (shown in the last inset).

If I'm on track there, I only have one more question - which is probably not your expertise if you haven't built an RV-14. If you don't know, maybe someone who has built one can answer? There are two oval-shaped holes in the F-01411 bulkhead. In the image it looks like L1082, which went through the snap bushing with the other wires, is looped back through the lightening hole, then through the small oval hole. This can't actually happen since that soldered connection won't fit through it. Maybe that's a tie-wrap depicted there?

And thank you VERY much for all your help!

 

[lipper03]

Yes it's a tie wrap on my 14. Not tightened at this point.

 

[Clrd4apprch]

Hey All,

TP724 is the 22 AWG shielded wire. This will be the only 22-1 wire in this harness, so you cant mix it up with a different one.

We typically do put a label on that wire, but that must have been missed in this instance - Sorry for the confusion.

I highly recommend that every RV-14 builder using Van's harness system download the WH-00125 harness document on Van's website. This is the master drawing that shows all of the Van's wiring harnesses in the system giving you a better understanding of the big picture.

Interestingly enough the TP724 wire is shown as white on that drawing, so I would bet that the Grey/Pu7thrple color is a typo (milspec 22-1 comes as a white wire unless you custom order it) that was corrected on some of their documents but not all.

Mine has the female pins on the wires. And the RS232 DIN connector has pins in it too. Is it best to remove the pins in the DIN and use the ones on the harness? Or cut the ones off the harness and solder to the pins on the DIN line the ELT directions say?

Chad

 

[TASEsq]

Think carefully about using that harness if you plan on using the Garmin autopilot servo.

The servo controls the elevator trim using PWM, and needs a shielded cable. The harness from Van’s uses unshaded wire.

It’s probably fine - but I didn’t want to risk any noise. Along with the 2 molex connectors being there for no reason, and the crazy wire routing to allow for both dynon and Garmin servos, I just run all my own wires. Cut up that harness and used the wire elsewhere.