brake warning light issue

[77c102door]

hey guys im having an issue with my brake warning light on my dash. When i depress the e-brake the brake warning light sometimes works and sometimes it doesn't. I looked to see if the ebrake switch is working but for the life of me i can't locate the switch. anybody has a pic of it on a 77 c10?

 

[Craig 85]

I'm not sure about a 77, but my '85 is similar to this picture. The switch is on the bottom right. It has an upside down "J".

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