Smoked some wires today

Ok so rechecked. There's definitely only a few ohms resistance between B and S, infinite between B and G. Infinite between B and I. 25ohms from S to I. I think I tested the first time by touching the connector on G and not the post.
Does this schematic of the inside of help you picture what connects inside starter relay?
upload_2020-8-19_21-7-36.png
Ignition to ground should have resistance.
Nothing else connects.