You can use a multimeter to check the wiring!
https://www.amazon.com/RANGE-RE831BL-Digital-Multimeter-Handheld/dp/B07S8PN23Z/ref=asc_df_B07S8PN23Z...
https://www.amazon.com/RANGE-RE831BL-Digital-Multimeter-Handheld/dp/B07S8PN23Z/ref=asc_df_B07S8PN23Z...