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Open Roads Forum  >  Tech Issues

 > Both blinkers flash for right and left

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dmussell56

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Posted: 09/18/22 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

On my Flagstaff T12rb when I turn on either the right or left turn signal, both right and left flash. It has a 7 pin connector as does my truck. I tested the truck to make sure that side sends iut the correct signal for right and left and it does.

When I look at the wires coming from the trailer harness there are only six wires running to the trailer. I can see the yellow wire (left turn) was cut off and is not connected to the trailer.

Is there anyway this ever worked without that wire being connected.

BTW, it was this way when I drove it off of the lot in 2021.

If they refuse to fix it under warranty is it as simple as connecting a wire to the yellow and run it back to the left rear light? Not that getting at the back light will be easy.

KD4UPL

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Posted: 09/18/22 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

Do your other lights come on? Do they all blink? I'd bet you simply have a bad ground connection.

BB_TX

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Posted: 09/18/22 07:17pm Link  |  Quote  |  Print  |  Notify Moderator

I don’t see any possible way it could have ever worked correctly if the left turn signal wire is not connected to the truck.

Did you check the wire colors at the taillights? I can’t imagine someone only ran one wire and jumpered the two lights. But then ????? I would certainly try to get the dealer to fix it under warranty. I am guessing no one checked the lights before pulling off the lot.

time2roll

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Posted: 09/18/22 07:28pm Link  |  Quote  |  Print  |  Notify Moderator

Check the frame grounds are good.


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dmussell56

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Posted: 09/18/22 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

All other light functions work.

dmussell56

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Posted: 09/18/22 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

I wasn’t going to try and pull off the taillights until I know if the dealer will fix it or not.

It looks as if I have to break the waterproofing around the top of the lights and then I hope the just twist off.

Lwiddis

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Posted: 09/18/22 08:13pm Link  |  Quote  |  Print  |  Notify Moderator

If you attempt a repair the dealer may decline to fix what he/she says you broke.


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Posted: 09/18/22 09:29pm Link  |  Quote  |  Print  |  Notify Moderator

Check all grounds.
Yellow is aux in the other wiring convention. There’s 2 different wiring color conventions.


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wnjj

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Posted: 09/19/22 12:23am Link  |  Quote  |  Print  |  Notify Moderator

Yellow is probably reverse lights, which isn’t wired up on your trailer. Check for a good ground, the lack of which often causes the problem as one side grounds back through the other via the tail light filaments.

The 7-way cord probably follows the “RV standard” shown on this page (scroll down to the pictures): https://www.etrailer.com/faq-wiring.aspx

Test the trailer itself with the cord unplugged from the truck by jumping from the +12v pin to each of the turn signals with a paper clip.

* This post was edited 09/19/22 12:52am by wnjj *

BB_TX

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Posted: 09/19/22 09:22am Link  |  Quote  |  Print  |  Notify Moderator

Good info above about some differences in 7 pin wire color coding.

If your clearance lights also flash then it is definitely a grounding issue.

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