Bizarre Turn Sign Issue

[Clean68]

This could be coincidental with the large update me 2021 had, the sync update. BUT for the past 3 days my turn signals in the rear are on, all the time. They only turn off if I turn the headlights off. As in their are solid yellow. If I engage my turn signals, the front blink normally, the indicator inside blinks rapidly and the rear turn signals are solid. Even if I do not have either blinker engaged the rears are solid. I have a tow hitch with lights hooked up, an aftermarket one that just piggy backs into the lights. But this issue is brand new. Any thoughts?

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[604Bronco]

Try disconnecting the battery for a bit?

 

[Crash98]

I had the same issues. I had the curt hitch light wiring installed and the harness went bad somewhere. I disconnected the harness and my blinkers in the rear worked again. Haven't had a chance to troubleshoot further because it's cold and rainy out.

 

[Clean68]

Exactly what I have. I’ll give that a go when it isn’t snowing. Hopefully the wiring harness isn’t bad, would be so fast.

I had the same issues. I had the curt hitch light wiring installed and the harness went bad somewhere. I disconnected the harness and my blinkers in the rear worked again. Haven't had a chance to troubleshoot further because it's cold and rainy out.

 

[Clean68]

I had the same issues. I had the curt hitch light wiring installed and the harness went bad somewhere. I disconnected the harness and my blinkers in the rear worked again. Haven't had a chance to troubleshoot further because it's cold and rainy out.

You ever figure this out?

 

[cbrenthus]

The first thing I would do would be to disconnect the wiring harness. That will tell you if it is the harness or the Bronco. I'd bet 99% on the harness.

 

[Crash98]

You ever figure this out?

No, I actually haven't tried, yet. I haven't needed the harness so it hasn't been a high priority for me. I suspect Curt just had a bad batch of harnesses sent out. I think I've seen a few more issues of the same variety pop on the forum.

 

[Clean68]

No, I actually haven't tried, yet. I haven't needed the harness so it hasn't been a high priority for me. I suspect Curt just had a bad batch of harnesses sent out. I think I've seen a few more issues of the same variety pop on the forum.

Not sure if this helps, but it only happens for me when the headlights go on. The blinker stays solid when in use. Then I can turn the head lights off and it works perfect.

 

[Heavy_GD]

if you removed the harness and resolved the issue, you could take a meter or test light to find the 12v source.

I would disconnect the plug from the lights leaving it attached to the truck then test it with the lights off, then with it on, you will quickly find which one of the wires is getting a signal.

Then determine the fix from there, remembering its clearly an issue tied to the update so I wouldn't go cutting the harness up as a patch may be on the way once this is reported.

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