There appears to be an adjusting nut above the spring which lets you set the proper tension. (Spring tension activates the brake lights).
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However, I wasn't able to turn the nut above the bracket. There isn't a nut below the bracket to hold fast - it's only a plastic nut-like clamp. I tried holding it with pliers while turning the nut, but it was too tight and I didn't want to shatter the lower nut. I decided to just use a small screwdriver to stretch the spring a bit, and it works like a charm.
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So, all-in-all, it should have been a simple fix. And it was, if you weren't there to hear the conversation between me and my beloved beautiful assistant of 51 years now.
Me: Could you come help me for a minute?
Her: Sure
Me: Just watch these lights and tell me when they go bright or dim.
Me: (releasing the tension on the switch)
Her: The "V" went out.
Me: ?? (Gets up and walks to the rear) What?
Her: (Pointing to the ">" shaped taillights) That "V" light went out.
Me: OK. You mean the light went completely out?
Her: Well, it got dimmer.
Me: Sigh. (Proceeds to work on the spring for a bit) OK, can you help me one more time?
Her: Sure.
Me: Just tell me.... you know. (turns on the ignition switch)
Her: It's bright.
Me: Already? (then proceeds to press the brake pedal)
Her: It's brighter.
Me: Releases the pedal
Her: It's bright.
At this point a short meeting is held about the benefits of communicating using terms "dim" and "bright" instead of "bright" and "brighter"...