Originally Posted by fishandfly
We hooked up yesterday to come to springstream and much to my dismay the lights do not work right. We ended up coming up anyway, but only by confusing drivers behind us the whole way.
Tow vehicle is an 04 Yukon denali with factory installed tow package and 7 way.
Brake light indications seen on airstream:
Brake- only left lights come on.
Left turn sig- left turn lights operate correctly.
Right turn- both left and right lights flash.
Hazard lights- lights flash like they should
Running lights- lights illuminated like they should be.
I replaced all bulbs. No change.
I checked all fuses
I checked wiring from 7 way and it is fine all the way until it goes into the frame and out of sight.
I pulled out the multimeter to test the seven way and:
All connections read like they should except that the right brake/turn is a constant 12v
What really throws me for a loop is the fact that the right lights are not constantly illuminated.
A loose ground will not send the signal on different wire paths it would only cause the light not to work but usually the ball connection with ground it anyway.
1986 trailer manual shows the following code for the trailer
Red- Stop/left turn should go to yellow on TV
Green- Taillight/ Clearance should go to brown on TV
Brown- Stop / right turn should go to green on TV
Yellow- Backup Should go to purple on TV
White- Ground same
Blue- Brake same
Positive should go to Red/black on TV
If you can't get into the TV to see what pens the wires are on then you will have to use a light pen or a volt meter.
I think you have two of the wires you listed crossed. The brake is activating the left turn signal. I think you can swap the red and brown wires on the trailer connector and fix it. Trailer Wiring Diagrams | etrailer.com
You can go down to the seven pin connector pair and substitute the airstream color code to the wire destination and it will give you the correct pen number on the plug and location
If I am reading the data right you have the brake from the TV and the Right turn signal wires reversed.
HOPE I AM STILL THINKING STRAIGHT AT 1:30AM
First you said right turn both right and left flashed.. then when you used a meter said the signal was constant?