Trailer brake lights not working but turn signals do. 2005 Yukon

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Big Mama

Big Mama

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Does your cruise control work? It’s any easy way to check that switch.
 
Fless

Fless

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Fless said:
The 3-to-2 circuit conversion is done either by the SUV's flasher, or by an aftermarket converter that was installed to get the 4-pin plug in place. You have one or the other.

Get underneath and trace the 4-pin harness to see if it simply connects to a body harness, or if there's a converter installed.
Click to expand...

Is there an aftermarket converter or incorrect aftermarket wiring? If so, that's the culprit. Otherwise change the flasher.
 
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