Loud buzz when headlight on

[u/brtbr-rah99]

2011 Sorento EX. Loud buzzing when headlights are switched on. No buzzing when the headlights are off and I use high beams. Search says so far a relay or ground issue. Ordered relay so will see today’s that’s the issue. Any other ideas?

Also I did some work on the passenger door this weekend. Replaced lock and window regulators. Did that work Saturday. Drove both Saturday and Sunday with no issues. Buzzing started yesterday.