Well I presume that the two upper ones are for the control wires. And the bottom two go to the the lamps. The Fuse gave it away.

https://www.ebay.com/itm/New-Delco-Remy-1116789-6-Volt-Universal-Headlight-Relay-1932-1954-GM-Car-Truck/202332549434?epid=1637436810&hash=item2f1bf5b13a:g:6vUAAOSwx8pa7fA~

Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC