Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Old 10-08-2021, 07:13 PM
jrock836's Avatar
jrock836 jrock836 is offline
Join Date: Nov 2020
Location: Burleson, Texas
Posts: 329
Default Trim Indicator Not Indicating

I'm try to troubleshoot why my trim indication isn't working. It stays planted at the bottom of the display. The servo still works. I have looked at all of the connections and plugged in / unplugged all three of the wires responsible for indicating the position of the trim servo and everything seems clean and secure. My trim servo is the Ray Allen ES MSTS-T3-7A-2 unit.

I do show 5 volts on white/blue wire coming from the EFIS.
As I understand it the two white wires 31/32 is just switched power to the servo to make it move each way. If that's the case, the only other wires to be concerned with would be the whi/grn (4) position wire and whi/orange (25) grnd wire. The (25) ground wire does show continuity to ground. Not sure how I should test the position (4) white/green wire.. Is there a voltage out of the servo I should be looking for? I'm showing about 1.4 volts which will vary as I move the trim up and dow..

Edit.. Nevermind.. I figured out the problem..

Apparently somewhere between the tail and the front fuselage harness, the grn/whi #4 wire is broken.. No continuity.. ugggg...
Attached Thumbnails
Click image for larger version

Name:	20211008_192029.jpg
Views:	54
Size:	297.5 KB
ID:	16895  Click image for larger version

Name:	20211008_192823.jpg
Views:	54
Size:	187.4 KB
ID:	16896  Click image for larger version

Name:	20211008_192835.jpg
Views:	55
Size:	282.7 KB
ID:	16897  
Van's RV-12 #120566 - ELSA - N49DD
Spinks Airport, KFWS, Fort Worth, TEXAS!


Last edited by jrock836 : 10-08-2021 at 09:42 PM.
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 08:31 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.