The extra plug in connector servers two purposes - to connect the lighting circuits from the mirror to the factory connect. This will get you blinker on the glass only. That’s the factory function. That’s what you had before. The amber forward shining light behaves as a running light/park light - meaning it comes on when your headlights are on. If you outrun your headlight switch to park lamp mode, that amber would turn but (in a factory state). Your issue is that you’re not setup for tow mirrors. The door harness in your truck is wired different - so there is a path you’ll have to go down to either modify your door harnesses or replace them with a set and … since your truck is as 2014, add additional wiring inside your cabin of your truck that runs into the engine bay/fuse block.
So if you want to get these work, it can be done but will require some additional thinks and effort to get there.
You can reach me at HarnessDR.com for more info. Use the “Contact Us” option there.
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