you can buy a plug-in adapter that makes the LED flash go away.

Here is an example of a 7-pin to 7-pin They make 4-pin to 4-pin, 7 to 4, etc.

CURT 57003 LED-Compatible 7-Way RV Blade Vehicle-Side Trailer Wiring Adapter
by Amazon.com
Learn more: https://www.amazon.com/dp/B00AFVOF3M...QMEMB2WK479FF2