The third brake light doesn't function on my 2003 XIT. Removed the unit and it works fine when 12v is applied. I get a little over 5v on the input line when the brake is activated. Is this a relay issue, if so, where is it located/how is it marked?
Thanks,
Terry
Given that it's a touring, I would start my investigation at the "usual" spot - wiring harness where it enters rear hatch.
Wiggle the harness while simultaneously taking the voltage reading!
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