Do you have power to the brake light contact at the socket when you apply the brakes?

 

As far as I know, I do. It's hard to hold the probe and manipulate the brake lever. But when I did , I have power . I'm starting to think that I'm not making contact in the socket due to wear. I'm gonna get a new taillight harness and see if that's the issue. It's a small investment.

 

Tie down the lever during testing

 

There's an idea. Didn't think of that. Thanks

 

The contact in the socket can sometimes get pushed down. Try and pulling it up with a hook tool. Carefully.