99 EX left outboard brake light inop

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Howdy all. As the title says, my left outboard brake light is inop. Filaments in bulb are ok, and the parking light in this assembly works ok. New bulb no fix. Other 3 brake lights and high mount brake light work ok, turn signal works ok, so doubt it's the fuse or brake pedal switch at fault.

How do I go about tracing this problem?

I've never monkeyed around with a meter to chase elec problems before, so detailed instructions would be a huge help!

Thanks

Mike