Clueless with Electrical Wire Gauge

Okay, I'll admit I am not knowledgeable about reading wiring diagrams.
Yes, I have the manual.
Yes, I have the car.

I bought some 20AWG wire and just as I was about to use it I decided it was visually not matching -- too small.
So, here we go.

I have rats that chewed the wiring.
I want to replace the problem area. Requires either running a new replacement wire or using some solder/heat shrink/replace the connector plus enough wire to bridge the gap created by the rat.

Here are the two...

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