Welcome to the forum.
By 2007 Beaver was fully integrated into the Monaco Coach lineup. Your best bet is to know which Monaco model (maybe the Dynasty) aligns with your Contessa and find a headlight diagram for it.
In 2007 they used the VIP Smart Wheel system so the headlight wires are routed through the VIP Smart Wheel controller. You should look at the VIP black controller box in the front electrical bay (outside under drivers feet) to see which model you have.
Then look up the VIP smart wheel model on line.
You can also tell us what the headlight issue is and one of our IRV2 members has probably had the same issue.
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV