Brake light switch install fail

Jason White /
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Working on electrical for my 1980 tomos A3 silver bullet. Using this diagram with much success until my final step, which was the brake light switch wiring. I was previously just taking the blue line from stator and grounding directly.

https://www.mopedarmy.com/w/images/d/d9/1980_A3_wiring_colored.JPG

I put this brake light switch in

https://www.treatland.tv/brake-light-switch-p/brake-light-switch-magura.htm

Wired according to this diagram but now notice my bike will only fire up and idle if I am holding my brake, if I let go it's dying right away.

My father said he thinks I need to look into resistor in tail light. I have this aftermarket tail light which doesn't appear to have one...

https://www.treatland.tv/puch-tomos-stock-tail-light-p/puch-stock-tail-light.htm

Could the lack of resistor be causing this? Grounding looks good on both ends?

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