Just curious why you used the polarity reverse adapter? My setup (same as yours) is plug and play with no extra gadgets. Which electronic relays are you using. I initially tried using one without the ground wire and had issues. Switched to one with a built in ground wire and everything was good.
I have painless wiring fuse box.
I had use polarity reverse adapter on turn signal LED flasher only.
Now I am using CEC no load LED flasher with ground wires
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