A 55 watt headlamp draws 4-1/2 amps. Two of them will pull 9 amps.
a 65 watt high beam light will draw almost 5-1/2 amps. Two will pull 11 amps.
All four headlamps will pull about 20 amps together.

That assumes a perfect world with no losses due to old components, decayed wiring, connections, etc.
Add more for the other lights.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon