Hi,
Do the brake lights turn off if you disconnect the brake light switch? If so, there must be an adjustment issue. If they don't, then we have a short to power at some point.
When you tested it, did you confirm the red wire with a black tracer has B+ voltage? It should at all times. The green wire with the yellow tracer should only receive power when the switch is actuated. That is the only power path for the brake lights unless something different is shorted.
So, you checked the switch with the DMM. I suspect you checked for continuity when the switch was open and then closed. Pay attention to how far the switch moves when the switch becomes open. Then, reinstall the switch and check if it is traveling far enough to open/break the power supply.
If you want to confirm the issue is at the switch, simply disconnect it and the lights should turn off. If they do, the switch needs to be adjusted.
Let me know.
Joe
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Monday, October 17th, 2022 AT 7:03 PM