headlight relays

Please could you help me with my electrical issue which I'm chasing down for a while on my FFR roadster. When I turn on my lights the light switch circuit breaker gets hot and shut down the lights after 20 minutes of driving. Then after a few minutes lights come back and then shut down again...

I'm wondering if I really need relays in the headlight curcuits? It seems to me that '65 vintage cars had very few. I understand what they are for, but using the switch that came with the complete I would think the y are not really necessary. I would appreciate any thoughts on this.