Can anyone tell me how to determine wire size for a wire running from the positive side of the battery to the main stud on a Ford starter relay? I guess a Chrysler relay would require the same.

Also how do I determine what wire size to use on the other stud that runs down to the starter?

Do those switches actually draw current? I'm electrical ignorant. I have a guy telling me I need 1 gauge wire on both terminals, but that seems way overkill. The only thing that circuit does is make the starter engage.

Any help will help.

Thanks